Answer:
4.74 g H2
Explanation:
First, balance your reaction:
N2 + 3H2 --> 2NH3
Now convert 26.7 g NH3 to moles NH3 by dividing by its molar mass (17.031 g/mol). Then multiply by the mole ratio of 3 mol H2 for every 2 mol NH3 to get moles of H2. Finally multiply by the molar mass of H2 (2.016 g/mol) to get grams of H2.
26.7 g NH3 • (1 mol NH3 / 17.031 g NH3) • (3 mol H2 / 2 mol NH3) • (2.016 g H2 / 1 mol H2) = 4.74 g H2
A chemistry student weighs out 0.128g of chloroacetic acid HCH2ClCO2 into a 250.mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.0700M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the equivalence point. Be sure your answer has the correct number of significant digits.
Answer:
19.3 mL
Explanation:
First we convert 0.128 g of chloroacetic acid into moles, using its molar mass:
0.128 g ÷ 94.5 g/mol = 1.354x10⁻³ molAs this acid is monoprotic, it requires the same number of moles of NaOH to be neutralized. This means that 1.354x10⁻³ moles of NaOH are required.
Now we calculate the volume of NaOH solution, using the given concentration and calculated number of moles:
Molarity = moles / litersliters = moles / Molarity1.354x10⁻³ mol / 0.0700 M = 0.0193 LWe can convert liters into mL:
0.0193 L * 1000 = 19.3 mLchemistry in formula of water
Answer: Unbalanced : H2O
Balanced : 2H2O
Explanation:
plzz mark as brainliest
H2O
Explanation:
Water (chemical formula: H2O) is a transparent fluid which forms the world's streams, lakes, oceans and rain, and is the major constituent of the fluids of organisms. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds.
please help me and dont send me a bitly link its a scam
Answer:
Explanation:
4)6.27x10^20/(6.02x10^23)(u should have this number on your formula sheet)=0.001 mol
5)7.4x6.02x10^23=44.548x10^23atoms
6)molar mass for K is 39.10g/mol
3.27x39.10=127.86g
Im bad at sig figs. Just do it urself(:p
(ONLY ANSWER IF U R SURE PLZ) A scientist is performing a fermentation of bioethanol and the current pH is roughly 6.5. What should the scientist do to get the pH to the optimum value of 5.0?
A. Increase the temperature, which will lower the pH.
B. Add an appropriate amount of acetic acid.
C. Adjust the airflow to allow more oxidation.
D. Add an appropriate amount of sodium hydroxide.
D. Add an appropriate amount of sodium hydroxide.
Usually, chemical processes require an optimum pH. This is the pH at which the desired chemical conversion gives the maximum yield.
As we can see, the pH of the system is much higher than the optimum pH. We can decrease the pH to the optimum pH of 5.0 by adding an appropriate amount of a base such as NaOH.
Hence, the pH can be brought to 5.0 from 6.5 by adding an appropriate amount of NaOH.
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Which of these results from cell division?
A. cells expand their membranes and double in size
B. cells separate all of their organelles into smaller parts
C. multiple daughter cells share a single nucleus
D. multiple daughter cells are formed from one parent cell
Answer:
. multiple daughter cells are formed from one parent cell
What scientifically goes on with a plasma ball?
Answer:
the electrode at the center of a plasma ball emits a high-frequency,high-voltage alternating electric current. This current flows through the plasma filaments to create colorful tendrils of light.
Explanation:
what colors depend upon the gases used inside the plasma ball? common gases include neon, argon, xenon, and krypton.
Help please science questions
It’s for 20 points
Answer:
1 , 2 , 3
Explanation:
Answer
Contributed by Paul Flowers, Klaus Theopold & Richard Langley et al.
General Chemistry at OpenStax CNX
Learning Objectives
Outline the general approach for the isolation of transition metals from natural sources
Describe typical physical and chemical properties of the transition metals
Identify simple compound classes for transition metals and describe their chemical properties
We have daily contact with many transition metals. Iron occurs everywhere—from the rings in your spiral notebook and the cutlery in your kitchen to automobiles, ships, buildings, and in the hemoglobin in your blood. Titanium is useful in the manufacture of lightweight, durable products such as bicycle frames, artificial hips, and jewelry. Chromium is useful as a protective plating on plumbing fixtures and automotive detailing.
the table shows the pH levels of four common items. If a student tests a sample of each item, which will turn a strip of red litmus paper blue?
a-lemon juice
b- vinegar
c-coffee
d-hand soap
please answer and have an explanation.
LINKS WILL BE REPORTED
1. This is very important in preventing the spread of pathogens in the kitchen.
Graphite and diamond are both solid forms of the element carbon. Which statement explains
the different properties of these two forms of carbon?
(1) Diamond has ionic bonding and graphite has metallic bonding.
(2) Diamond has metallic bonding and graphite has ionic bonding.
(3) Diamond has a different crystal structure from graphite.
(4) Diamond has carbon atoms with more valence electrons than graphite.
Answer: C diamond has a different crystal structure from graphite
Explanation:
The difference between the properties of two forms of carbon is that
Diamond has a crystal structure different from graphite.
Graphite and Diamond are known as allotropes of Carbon as they have the
same chemical properties but different crystal structure.
Diamonds form a 3 crystal lattice with no flexibility while Graphite are
bonded to sheets which makes them slide easily within one another and
gives it its soft texture.
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How many grams of O2 are needed to
combust 20.0 g of C3Hg?
A balloon inflated in a room at 24°C has a volume of 4.00 L. The balloon is then heated to a temperature of
58°C. What is the new volume if the pressure remains constant?
Answer: 4.46 L
Explanation: By using Charles’s Law, we know that V1/T1=V2/T2. And whenever temperature is involved, you have to convert from Celsius to Kelvin (C° + 273). So, 4.00/ 24 +273 = V2/ 58 + 273. So the answer is, around 4.46 L.
Environments have changed over millions of years. Which of these would be best for a scientist to study when investigating these environmental changes?
A. volcanic deposits
B. weather forecasts
C. fossil records
D. ocean currents (There is no science subject so ima put mathematics)
Answer:
c
Explanation:
fossil records
1. In apothecaries' measures: 1 scruple = 20 grains, 1 ounce = 480 grains, 1 oz = 28.34 g
What is the mass in micrograms of 5.00 scruples? Remember the known and the
unknown?!
Answer:
5.89 g × 10⁶ μg
Explanation:
Step 1: Convert 5.00 scruples to grains
We will use the conversion factor 1 scruple = 20 grains.
5.00 scruple × 20 grain/1 scruple = 100 grain
Step 2: Convert 100 grains to ounces
We will use the conversion factor 1 oz = 480 grains.
100 grain × 1 oz/480 grain = 0.208 oz
Step 3: Convert 0.208 oz to grams
We will use the conversion factor 1 oz = 28.34 g.
0.208 oz × 28.34 g/1 oz = 5.89 g
Step 4: Convert 5.89 g to micrograms
We will use the conversion factor 1 g = 10⁶ μg.
5.89 g × 10⁶ μg/1 g = 5.89 g × 10⁶ μg
The mass in micrograms of 5 scruples is 5.9×10⁶ μg
We'll begin by converting 5 scruples to grains.
1 scruple = 20 grains
Therefore,
5 scruples = 5 × 20
5 scruples = 100 grains Next, we shall convert 100 grains to grams480 grains = 1 ounce
But
1 ounce = 28.34 g
Thus, we can say that
480 drains = 28.34 g
Therefore,
100 grains = (100 × 28.34) / 480
100 grains = 5.9 grams Finally, we shall convert 5.9 grams to micro grams1 g = 1×10⁶ μg
Therefore,
5.9 g = 5.9 × 1×10⁶ μg
5.9 g = 5.9×10⁶ μgTherefore, 5 scruples is equivalent to 5.9×10⁶ μg
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A gas made up of atoms escapes through a pinhole 0.392 times as fast as Ne gas. Write the chemical formula of the gas.
Answer: The chemical formula of the gas is Xenon.
Explanation:
From Graham's law of effusion rates, the rate of effusion of a gas is inversely proportional to the square root of its molar mass.
[tex]\frac{rate_1}{rate_2}=\sqrt{\frac{M_2}{M_1}}[/tex]
Given: Rate of unknown gas = [tex]0.392\times R_{Ne}[/tex]
Putting the values in the formula:
[tex]\frac{rate_X}{rate_{Ne}}=\sqrt{\frac{M_{Ne}}{M_X}}[/tex]
[tex]0.392=\sqrt{\frac{20.17}{M_X}}[/tex]
Squaring both sides:
[tex]0.154=\frac{20.17}{M_X}[/tex]
[tex]M_X=131g/mol[/tex]
As Xenon (Xe) has molar mass of 131g/mol, Thus the chemical formula of the gas is Xenon.
explain why vendors keep 'dry ice' in their ice cream boxes
Vendors keep 'dry ice' in their ice cream boxes in order to prevent melting of dry ice.
Why vendors keep 'dry ice' in their ice cream boxes?Dry ice melts if it is placed in the open space because the carbondioxide gas is compressed with pressure. As carbon dioxide changes to gas, it escape to the atmosphere. If you use an airtight container such as ice cream box, the gas cannot escape.
So we can conclude that vendors keep 'dry ice' in their ice cream boxes in order to prevent melting of dry ice.
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a chemical formula is made up of carbon and oxygen. they have 27% and 73% respectively.
A.what is the empirical formula of the chemical substance?
B.name the compound you identified in A above.
Answer:
A. CO₂
B. carbon dioxide
Explanation:
To determine the empirical formula of a compound, we need to follow a series of steps.
Step 1: Divide each mass percent by the atomic mass of the element
C: 27/12.01 = 2.25
O: 73/16.00 = 4.56
Step 2: Divide all the numbers by the smallest one, i.e., 2.25
C: 2.25/2.25 = 1
O: 4.56/2.25 ≈ 2
The empirical formula of the compound is CO₂. The name of this compound is carbon dioxide.
Radium-222 undergoes radioactive decay to produce radon-218. Which
particle needs to be added to this equation to show that the total numbers of
neutrons and protons are not changed by the reaction?
22 Ra
21°Ra + ?
88
86
A. He
B. o
tie
c. Le
D. He
Answer:
2/4 HE
Explanation:
Ape.x
Which of the following equations correctly describes how to calculate net income? a. net income = (cost of goods sold) - (net sales) - (operating expenses) b. net income = (operating expenses) - (cost of goods sold) - (net sales) c. net income = (operating expenses) + (cost of goods sold) - (net sales) d. net income = (net sales) - (cost of goods sold) - (operating expenses) Please select the best answer from the choices provided A B C D Mark this and return
Answer:
The answer is D. net income= (net sales) - (cost of goods sold)- (operating expenses).
Explanation:
Demonstrate the definition with a chemical equation for HCl. Express your answer as a chemical equation including phases
Answer:
Here ya go!
Explanation:
Given the reaction below which of the following best describes the energy changes in this reaction?
Cu + Cl2 + energy —> CuCl2
Answer:
first choice
Explanation:
energy is written on the left side is its absorbed
2 elements came together so bonds are formed.
True or False: With a given number of moles of solvent, the solution will always have the same concentration
Answer:
Its true
Explanation:
Hope it helps, have a great day!!!
What is the wavelength of a photon with a frequency of 4.72 x 1014 Hz?
A. 635 nm
B. 142 nm
C. 421 nm
D. 313 nm
Answer:
635 nm
Explanation:
more simple answer
The correct option is (a) 635 nm.
What is a simple definition of a wavelength?A wavelength that is carried in space or down a wire has a wavelength, which is the separation between two identical places (adjacent crests) in the consecutive cycles.Wavelength is usually denoted by the Greek letter lambda (λ)Given,
λ=6.36×10−7 m
Let C = the speed of light =3.00× [tex]10^{8}[/tex] m/s
Let f = the frequency = 4.72 × [tex]10^{14}[/tex] Hz
Let λ= the unknown wavelength
Now apply formula of wavelength
λ = C /f
λ = [tex]\frac{3.00 * 10^{8 }m/s }{4.72 * 10^{14} Hz}[/tex]
λ = 6.36 × [tex]10^{-7}[/tex] m
λ = 635 m
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What is the mass of 3.5 x 10 23 molecules of co2
Answer:
x = 3/6.02 = 0.50.
Explanation:
1 mole of CO2 has 6.02 x 10^23 molecules of CO2.
Say x moles of CO2 has 3.0x10^23 molecules of CO2.
Therefore x = 3/6.02 = 0.50.
If the reaction is begun with an initial PH3 concentration of 0.95 M, what will be the concentration of PH3 after 30.50 s
Answer:
[tex][PH_3]=0.30M[/tex] but see detailed explanation, please.
Explanation:
Hello there!
In this case, unfortunately, we are not given the rate constant but we can set up a reaction according to the information available on the internet:
[tex]4PH_3\rightarrow P_4+6H_2[/tex]
Whose rate constant is 0.0375/s. In such a way, it is possible infer that this is first-order reaction whose integrated rate law is:
[tex][PH_3]=[PH_3]_0exp(-kt)[/tex]
Thus, given the initial concentration, rate constant and elapsed time, the final concentration of PH3 would be:
[tex][PH_3]=(0.95M)exp(-30.50s*0.0375/s)\\\\[/tex]
[tex][PH_3]=0.30M[/tex]
However, it is important to keep in mind this result may vary according to your actual question.
Regards!
Which of the following molecules have a dipole moment?
Select one or more:
CS2
SeS2
CINO
ВСІЗ
CClaF2
CO2
PCIE
Com
Answer:
cs2
Explanation:
Question
How much of 3 M NaOH will be required to make 100 mL of 0.05 M NaOH?
Select the correct answer below:
5 mL
1.7 mL
0.15 mL
30 mL
Answer:
1.7 mL
Explanation:
start with formula M1V1=M2V2
then plug in values (3)V1=(100)(.05) and solve for V1
V1= 1.66
According to molar concentration, 1.7 ml of of 3 M NaOH is required to make 100 ml of of 0.05 M NaOH.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
In case of 2 solutions, molarity is determined as, M₁V₁=M₂V₂
Substitution of values gives, V₁=0.05×100/3=1.7 ml.
Thus, 1,7 ml of 3 M NaOH will be required to make 100 mL of 0.05 M NaOH.
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(b) What is the frequency of violet light with a wavelength of 433 nm?
Frequency
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True or False: Having a greater volume definitely means a lower concentration (molarity) solution
Having a greater volume definitely means a lower concentration (molarity) of solution. So, the statement is true.
What is meant by molarity of a solution ?Molarity of a solution is defined as the number of moles of solute present per unit volume of solution.
Here,
Since, the number of moles of solute in one litre of solution is known as the molarity, we can say that the change in volume of the solution will affect the molarity of the solution.
Molarity, M = n/V
where n is the number of moles of solute and V is the volume of solution
From the equation, we can say that the molarity of the solution is inversely proportional to its volume.
We know that, molarity of a solution is a temperature dependent parameter.
As the volume of the solution increases, the temperature also increases( Volume [tex]\alpha[/tex] Temperature). When the temperature increases, it affects the molarity of the solution such that the number of moles remains constant and as a result of the increasing volume, the molarity decreases.
Hence,
Having a greater volume definitely means a lower concentration (molarity) of solution.
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A potential energy diagram is shown. What is the activation energy of this reaction?
a. 50 kJ
b. 100kJ
c. 150kJ
d. 200kJ
Answer: a. 50 kJ
Explanation: good luck