Answer:
1.05 mols of O2 gas
Explanation:
For this type of problem, it's important to understand what the balanced Chemical equation tells us:
Balanced Chemical equationsLet's look at the balanced chemical equation:
[tex]2Mg(s)+O_2(g)-- > 2MgO(s)[/tex]
This equation two sides of the reaction arrow. On the left are the reactants (things you start with, and that react during the chemical reaction), and on the right side are products (things that are produced during the chemical reaction that you end with).
The numbers in front of each compound tell how many of molecules are involved for a full reaction without anything left over. A "mol" is a large quantity ([tex]6.022*10^{23}[/tex]), in this case, of molecules , since it's unlikely you're only taking a single molecule of each substance (it would be so tiny, you wouldn't even know you were doing the reaction).
So,for every 2 moles of Magnesium used, we'll also need 1 mole of Oxygen, and it will produce 2 moles of Magnesium Oxide.
In a way, during the reaction it's almost like 2 moles of Magnesium is equal to 1 mole of Oxygen and is equal to 2 moles of Magnesium Oxide:
[tex]2 mol Mg(s)=1mol O_2(g)=2molMgO(s)[/tex]
From here, we can build some unit ratios, to convert between the known quantity of moles we have, and find the unknown quantity of moles that are requested.
Finding the right unit ratioWe know that we are looking at 2.10 mol of Magnesium, so we want a unit ratio with moles of Mg on the bottom. We want to find moles of O2, so we want a unit ratio of moles of O2 on top.
The unit ratio we want is the middle part of the equation, divided by the left part of the equation.
[tex]2 mol Mg(s)=1mol O_2(g)\\\frac{2 mol Mg(s)}{2 mol Mg(s)}=\frac{1mol O_2(g)}{2 mol Mg(s)}\\1=\frac{1mol O_2(g)}{2 mol Mg(s)}[/tex]
Since this quantity is 1, it is a unit ratio and can be multiplied to other things to change their units (for this problem).
Finding the answerStarting with what we know, and multiplying by our unit ratio:
[tex]2.10 mol Mg(s)*\frac{1mol O_2(g)}{2 mol Mg(s)}=1.05mol O_2(g)[/tex]
Notice that the units from the first quantity cancel with the units on the bottom of the fraction, leaving only the unit on top of the fraction ... the exact units we wanted!
So, 1.05mols of O2 would be consumed during the reaction if exactly 2.10moles of Magnesium are burned.
- How many grams are in 1.4 x 10¹5 atoms of calcium?
Answer:
40 g= 6.022×10²³
x=1.4×10¹⁵
x=40g×6.022×10²³/1.4×10¹⁵
x=17.77×10⁸
Which is a property of all bases?
Answer:
can change red litmus to blue litmus
Explanation:
please mark me as brainlest
5 Examples of simple salts
someone people help me with this chemistry question
Answer:
6 moles
Explanation:
From the equation you can see that twice as many HCL moles are used as H2 produced
2 x 3 = 6 moles of HCL required
Which of the following is the best example of an isolated system?
OA. A bus at a bus station
B. An astronaut in a spaceship
OC. A car on the freeway
D. A motorcycle in a garage
Answer:
B. An astronaut in a spaceship
Isolated system :-
In an isolated system, there is no transfer of energy or matter between the system and the environment.
Hope it helps!
How many valence electrons will a Cl- ion have?
Answer:
8
Explanation:
im pretty sure it'll be 8 electrons
What happens to a 8 L volume of gas as you love a pressure of 3 atm to 4 atm? Use the correct gas law to determine the new volume
Assuming pressure is held constant,
[tex]\frac{8}{3}=\frac{V_{2}}{4}\\\\V_{2}=4\left(\frac{8}{3} \right) \approx \boxed{10.7 \text{ L}}[/tex]
what is the relationship of work with distance and the force?
The good answer will be marked as brainlist.....
Answer:
Work is the use of force to move an object. It is directly related to both the force applied to the object and the distance the object moves. Work can be calculated with this equation: Work = Force x Distance.
:)
Felicity lists the factors that affect the shape of Florida.
Which does not belong in this list?
Answer:
if the Florida inters into the land se hokar gar ke bill Tak jane ke process Florida kahte hai aur bur ka bal se doodh chusne Tak wo Florida s
Humidity, thermometer, and rainfall factors affect the shape of Florida, making the shape different.
What is the shape of Florida?In general, a molecule's electron pairs will take on a structure that maximizes theirs from one another.
Even charges repel one another, whereas dissimilar charges attract H₂O, for instance, containing two pairs of lone electrons but taking on an angular form.
Sand ridges, like the Lake Wales Ridge, were created during dry times from sediments that had been transported by ocean currents and deposited to form islands.
Latitude, land and water distribution, dominant winds, hurricanes, pressure systems, and ocean currents are the main variables that influence Florida's climate.
Therefore, as glaciers retreated throughout cooling cycles, sea levels dropped and Florida occasionally doubled in size.
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Part E
From the observations of the simulation, which strategy was most effective for quickly and efficiently producing ammonia? Why do you think this strategy is most effective?
The production of ammonia will be favored at high pressure and low temperature.
What is an exothermic reaction?The term exothermic reaction has to do with a reaction in which the forward reaction is favored at lower temperatures.
Now looking at the reaction coordinate and the equation of the reaction, we know that the production of ammonia will be favored at high pressure and low temperature.
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light frequency 1.40x10^15 Hz strike a surface causing photoelectrons to leave with a KE of 1.05 eV what is the work function in eV
Answer:
The Work Function is 4.74eV.
Explanation:
The photoelectric effect is a phenomenon in which a beam of light is projected towards a metal plate and this leads to the ejection of electrons from the metal. The minimum amount of energy required for this ejection of electrons is known as the work function. When the energy of the light beam is less than the work function, then the electrons are not emitted.
The photoelectric effect is represented by the equation:
E = φ + KE where
E = energy of the incident photons
KE = kinetic energy of photoelectrons
φ = Work function of the metal
This can also be written in terms of frequency as:
h = h₀ + [tex]\frac{1}{2}[/tex] mv²
= frequency of the incident light beam
₀ = frequency of the photoelectrons
m = mass of the electron
v = velocity of the electron
h = Plank's constant 6.623 x 10⁻³⁴Js
Conversion factor: 1eV = 1.602 x 10⁻¹⁹ J
So, 1.05eV = 1.682 10⁻¹⁹ J
Using the formulas,
(6.623 x 10⁻³⁴Js)(1.40x10¹⁵ s⁻¹) = φ + 1.682 x 10⁻¹⁹ J
(9.272 x 10⁻¹⁹) - (1.682 x 10⁻¹⁹) = φ
φ = 7.590 x 10⁻¹⁹ J = 4.74 eV
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Match the action to the effect on the equilibrium position for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g). (3 points)
1.
Adding hydrogen gas
2.
Adding a catalyst
3.
Decreasing the pressure
a.
Shift to the left
b.
Shift to the right
c.
No effect
Answer:
1. Adding hydrogen gas, b. shift to the right
2. Adding a catalyst, c. No effect
3. Decreasing the pressure, a. shift to the left
Explanation:
Hydrogen gas can be rewritten as H2. Whenever you add something to an equilibrium expression, it will shift to whichever side does not have this. So, since the reactant side has 3 moles of H2, adding more H2 to the reaction will shift to the products side, since there is no H2 there.
Adding a catalyst has no effect on equilibrium reactions.
When decreasing the pressure, equilibrium will shift to the side with the greater number of moles of gas. In this case, there are 4 moles of gas on the left, and 2 on the right, so it would shift to the left.
➪ State the difference between molarity(M) and molality (m) ?
[tex]\sf{}[/tex]
⛄
Need ASAP please and thank you
The empirical formula would be [tex]C_2H_3O_2[/tex] and the molecular formula would be [tex]C_4 H_6 O_4[/tex]
Empirical and molecular formulaFrom the illustration:
C = 40.6 g H = 5.1 g O = 54.2 g
Divide each element by its molar weight:
C = 40.6/12 = 3.4 H = 5.1/1 = 5.1 O = 54.2/16 = 3.4
Divide by the smallest:
C = 3.4/3.4 = 1 H = 5.1/3.4 = 1.5 O = 3.4/3.4 = 1
Thus, the empirical formula is [tex]C_2H_3O_2[/tex]
To find the molecular formula:
[ [tex]C_2H_3O_2[/tex]]n = molecular formula
where n = molar mass/empirical formula mass
Empirical formula mass = 24 + 3 + 32 = 59
n = 118.084/59 = 2
Thus, the molecular formula is [tex]C_4 H_6 O_4[/tex] which is more or less the same as the empirical formula.
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The Empirical formula will be C₂H₃O₂ and the Molecular formula would be C₄H₆O₄
What is Empirical and Molecular Formula ?Empirical formula is a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.
Molecular formula is a chemical formula that gives the total number of atoms of each element in each molecule of a substance.
Given ;
C = 40.6 gH = 5.1 gO = 54.2 gDivide each element by its molar weight:
C = 40.6 / 12 = 3.4H = 5.1 / 1 = 5.1 O = 54.2 / 16 = 3.4Divide by the smallest Value:
C = 3.4/3.4 = 1H = 5.1/3.4 = 1.5 O = 3.4/3.4 = 1Thus, the Empirical formula is C₂H₃O₂
Now, to find the molecular formula ;
[C₂H₃O₂ ]n = molecular formula
where n = molar mass / empirical formula mass
Empirical formula mass = 24 + 3 + 32 = 59
n = 118.084 / 59 = 2
[C₂H₃O₂ ]n = molecular formula
[C₂H₃O₂ ]2 = C₄H₆O₄
Thus, the Molecular formula is C₂H₃O₂
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why is it important to convert currency units from one type to another chemistry
easy to compare
easy in calculation
adjust to units commonly used in certain places
Need answer asap!! Molecules in the solid state
A) transfer heat to neighboring molecules by convection
B) have no motion
C) have no internal energy
D) vibrate in fixed positions
Answer:
c, have no internal energy
Calculate the pH of a solution with [H+] = 2.52 x 10^-5.
Answer:
pH = 4.6
Explanation:
pH is the negative of the log of the hydrogen ion concentration
- log { 2.52 x 10^-5) = ~ 4.6
HELP! ASAP!
2. What is the role of activation energy in a chemical reaction? Using your understanding of activation energy, explain why a piece of paper sitting in a 70° F room does not ignite/burn/react even though there is plenty of oxygen to go around (the cellulose of paper can react with oxygen to form carbon dioxide and water).
Activation energy is required so reactants can move together, overcome forces of repulsion, and start breaking bonds.
What is activation energy?The minimum amount of energy that is needed to activate atoms or molecules to a condition in which they can undergo a chemical transformation or physical transport.
The activation energy of this chemical reaction is high that it will not start at room temperature. This is why a source of heat is required to start the fire: the “energy barrier” must be overcome before the reaction can proceed further.
In any chemical reaction, existing chemical bonds should be broken before new bonds formation. The breaking of chemical bonds requires an input of energy. In some reactions, the thermal energy at room temperature is enough to break the bonds.
In other cases, the thermal energy at room temperature does NOT give enough energy to break the needed bonds (by facilitating sufficiently energetic molecular collisions) to get the reaction started.
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7. How can it be said that two water molecules represent more entropy than two hydrogen molecules plus
an oxygen molecule?
The reason for this is that water is a polar molecule and one water molecule is attracted to the other by a hydrogen bond.
What is entropy?The term entropy refers to the degree of disorder in a molecule. The more disorderly a molecule is, the higher its entropy.
The fact that water is a polar molecule and one water molecule is attracted to the other by a hydrogen bond thus, two water molecules represent more entropy than two hydrogen molecules plus an oxygen molecule.
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Please show steps Thanks
Answer:
chuma ya ndoshi.............
Explanation:
.
kwenda ukalale .............
b. Describe hydrogen bonding. (1 point)
Indicate the number of significant figures in the following measured numbers:
a. 45 = __________
f. 980.00 = __________
b. 450 = __________
g. 740000 = __________
c. 0.0045 = __________
h. 0.00000042 = __________
d. 3006 = __________
i. 4050600 = __________
e. 0.00780 = __________
j. 230.0050 = __________
Answer: a = 2 ; f = 5 ; b = 2 ; g = 2 ; c = 2 ; h = 2 ; d = 4 ; i = 5 ; e = 3 ; j = 7
Explanation: Some rules to follow while calculating sig figs is
1. If a number like 4500 is present, only two sig figs are counted, but none of the zeros are, but if 4500. has a decimal point present, then you should count all the numbers available.
2. If a number like .0005 is present, only count 5 as a sig fig, however if the number is .00050, count the 0 after the 5 in this example (this would then have two sig figs.
Question 9 of 10
What is an open system?
OA. A system that allows energy to move in and out but not mass
B. A system that allows energy and mass to move in and out of it
XA
Answer:
The answer is B an open system allows energy and mass to move in and out of it
Hope it helps
Why barbituric acid in name of acid
Determine the number of protons, neutrons, and electrons in the following:
40
. . X
18
Ignore the dots im just trying to place the element over between the numbers
The ⁴⁰₁₈X is the symbol for ⁴⁰₁₈Ar - atom and it has 18 protons, 18 electrons, and 22 neutrons.
What is Mass number ?Mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom.
In the given element, ⁴⁰₁₈X, Subscript 18 is the number of proton and is also equal to the number of electron. While supercript 40 is the atomic mass.
The number of neutrons is given by subtracting the proton number from the mass number.
Therefore,
Number of Neutron = Mass Number - Atomic Number
= 40 - 18
= 22 Neutrons
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Using a table of standard electrode potentials, label each of the following statements as completely
true or false.
A) Cu²+ can oxidize H2, and Fe can reduce Mn²+
B) Ni²+ can oxidize Cu²+, and Fe²+ can reduce H+
C) Fe²+ can oxidize H₂, and Fe²+ can reduce Au³+.
D) Br₂ can oxidize Ni, and H₂ can reduce Mn²+
E) H* can oxidize Fe, and Ni can reduce Br₂
Answer: B and E are True
Explanation:
Because Fe has a higher oxidation potential than H2, H+ can oxidize it.
[tex]$\begin{array}{llllll}\mathrm{Fe} & \rightarrow & \mathrm{Fe}^{2+} & +2 \mathrm{e}- & \mathrm{E}^{0}=0.44 \mathrm{~V} \\ \mathrm{H} & \rightarrow & \mathrm{H}^{+} & + & \mathrm{e}^{-} & \mathrm{E}^{0}=0 \mathrm{~V}\end{array}$[/tex]
Ni can reduce Br2 because the reduction potential of Ni is more than Br2.
[tex]\mathrm{Ni}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Ni}^{-} \quad \mathrm{E}^{0}=-0.25 \mathrm{~V}\\2 \mathrm{Br}^{-} \quad \rightarrow \mathrm{Br}_{2}+2 \mathrm{e}^{-} \quad \mathrm{E}^{0}=-1.087 \mathrm{~V}$[/tex]
How do models help scientists predict the polarity of molecules?
This is from the Molecular Structure Lab Report: Determining Polarity
In conclusion, modeling is very useful for predicting molecular polarity because chemical bonds among different atoms are generated to equal electrical charges.
What is molecular polarity?Molecular polarity refers to the unequal distribution of electrical charges in the atoms of a molecule.
This unequal distribution leads to the generation of molecular poles (positive and negative) at the ends of the chemical bonds.
In conclusion, modeling is very useful for predicting molecular polarity because chemical bonds among different atoms are generated to equal electrical charges.
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Can you help me with this with a solution
The complete table is inserted.
A table is given,
Formulas used:
pH= -log(H⁺)
pOH= -log(OH⁻)
pH+ pOH=14
Calculations:
For A: (H⁺)=2×10⁻⁸M
Using the pH formula:
pH= -log(H⁺)=-log(2×10⁻⁸)=7.69
pOH=14 - 7.69=6.3
Calculating OH concentration,
pOH= -log(OH⁻)
6.3= -log(OH⁻)
(OH⁻)=5.011×10⁻⁷M
Hence, the nature of A is basic.
Similarily,
For B,
(OH⁻)=1×10⁻⁷
Using the pH formula:
pOH= -log(OH⁻)= -log(1×10⁻⁷)=7
pH=14-7=7
Calculating H concentration,
pH= -log(H⁺)
7= -log(H⁺)
(H⁺)=1×10⁻⁷M
Hence, the nature of B is neutral.
Similarily,
For C,
pH=12.3
Using the pH formula:
pOH=14-12.3=1.7
Calculating H concentration,
pH= -log(H⁺)
12.3= -log(H⁺)
(H⁺)=5.011×10⁻¹³M
Calculating OH concentration,
pOH= -log(OH⁻)
1.7= -log(OH⁻)
(OH⁻)=1.99×10⁻²M
Hence, the nature of C is Basic.
Similarily,
For D,
pOH=6.8
Using the pH formula:
pH=14-6.8=7.2
Calculating H concentration,
pH= -log(H⁺)
7.2= -log(H⁺)
(H⁺)=6.309×10⁻⁸M
Calculating OH concentration,
pOH= -log(OH⁻)
6.8= -log(OH⁻)
(OH⁻)=1.58×10⁻⁷M
Hence, the nature of D is basic.
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Pyroxene and Olivine are two minerals formed by the cooling of lava, whereas quartz and feldspar are formed as magma cools.
a. Based on the way they form, which two minerals will be comparatively bigger in size?
b. Why? Provide scientific evidence to support your answer
Quartz and Feldspar will be comparatively larger in size since they are formed from cooling of magma while Pyroxene and Olivine are formed by the cooling of lava.
What is the difference between magma and Lava?Magma is molten rock that is found deep within the earth's crust whereas Lava is molten rocks that comes up and flows on the earth's surface.
Minerals formed from magma and lava have comparatively different sizes.
Minerals formed from magma are larger in size than minerals formed from Lava. This is because minerals formed from magma undergo slower cooling, and thus, have a longer time to grow in size. However, minerals formed from lava have a relatively shorter cooling time and do not grow into very large sizes.
Therefore, Quartz and Feldspar will be comparatively larger in size since they are formed from cooling of magma while Pyroxene and Olivine are formed by the cooling of lava.
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Calculate how many grams of the product form when 16.7 g of calcium metal completely reacts. Assume that there is more than enough of the chlorine gas.
Ca(s) + Cl2(g) → CaCl2(s)
39.96 g product form when 16.7 g of calcium metal completely reacts.
What is the stoichiometric process?Stoichiometry is a section of chemistry that involves using relationships between reactants and/or products in a chemical reaction to determine desired quantitative data.
Equation:
[tex]Ca(s) + Cl_2(g)[/tex] → [tex]CaCl_2(s)[/tex]
In this case, for the undergoing reaction, we can compute the grams of the formed calcium chloride by noticing the 1:1 molar ratio between calcium and it (stoichiometric coefficients) and using their molar mass of 40 g/mol and 111 g/mol by using the following stoichiometric process:
[tex]m_{ca_C_l_2}[/tex]= 16.7 g Ca x [tex]\frac{1 mol \;of \;Ca}{40g Ca}[/tex] x [tex]\frac{1 mol \;of \;CaCl_2}{1 mol \;Ca}[/tex] x [tex]\frac{111g of \;CaCl_2}{1 mol \;CaCl_2}[/tex]
[tex]m_{ca_C_l_2}[/tex] = 39.96 g
Hence, 39.96 g product form when 16.7 g of calcium metal completely reacts.
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