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:

30.1 g NaCl

Explanation:

Your first conversion is converting grams NaOH to moles of NaOH using its molar mass (39.997 g/mol). Then, use the mole ratio of 1 mol NaCl for every 1 mol NaOH to get to moles of NaCl. Then finally multiply by the molar mass of NaCl (58.44 g/mol) to get grams of NaCl.

20.6 g NaOH • (1 mol NaOH / 39.997 g NaOH) • (1 mol NaCl / 1 mol NaOH) • (58.44 g NaCl / 1 mol NaCl) = 30.1 g NaCl

Answer:

A. 30cm³

Explanation:

Based on the chemical reaction:

CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂

1 mol of calcium carbonate reacts with 2 moles of HCl to produce 1 mol of CO₂

To solve this question we must convert the mass of each reactant to moles. With the moles we can find limiting reactant and the moles of CO₂ produced. Using PV = nRT we can find the volume of the gas:

Moles CaCO₃ -Molar mass: 100.09g/mol-

1.00g * (1mol / 100.09g) = 9.991x10⁻³ moles

Moles HCl:

50cm³ = 0.0500dm³ * (0.05 mol / dm³) = 2.5x10⁻³ moles

For a complete reaction of 2.5x10⁻³ moles HCl there are necessaries:

2.5x10⁻³ moles HCl * (1mol CaCO₃ / 2mol HCl) = 1.25x10⁻³ moles CaCO₃. As there are 9.991x10⁻³ moles, HCl is limiting reactant.

The moles produced of CO₂ are:

2.5x10⁻³ moles HCl * (1mol CO₂ / 2mol HCl) = 1.25x10⁻³ moles CO₂

Using PV = nRT

Where P is pressure = 1atm assuming STP

V volume in L

n moles = 1.25x10⁻³ moles CO₂

R gas constant = 0.082atmL/molK

T = 273.15K at STP

V = nRT / P

1.25x10⁻³ moles * 0.082atmL/molK*273.15K / 1atm = V

0.028L = V

28cm³ = V

As 28cm³ ≈ 30cm³

Right option is:

Answer:

the correct answer is D

Explanation:

Basically, melting ice is an endothermic reaction because the ice absorbs (heat) energy, which causes a change to occur.

Answer:

GIVEN IT'S A MULTI CHOICE QUESTION:

1. False

2. True

3. False

4. True

IF ITS NOT

2

Explanation:

We haven't made human clones because human cloning is extremely controversial and many people believe it is unethical.

Cloning is a genetic technique that can be used to reproduce genetically identical organisms in a laboratory.

In conclusion, we haven't made human clones because human cloning is extremely controversial and many people believe it is unethical.

Learn more in:

https://brainly.com/question/4736686

Answer:

2c11h21

Explanation:

Answer:

Bismuth, because when three cubes of the same mass were heated and dropped into the same temperature water, the water the bismuth cube was dropped in heated up much less than the water with iron or tin.

REWRITE THIS IN YOUR OWN WORDS PLEASE, THANK YOU.

Credits to: www.generationgenius.com › wp-content › uploads

The greatest heat capacity is possessed by iron.

The heat capacity of materials increases as the number of particles in the material or density of the material increases.

This means that the denser a material is, the higher its heat capacity because it has more particles that absorbs heat.

The heat capacity is the quantity of heat required to raise the temperature of 1 gram of a material by  1°C.

The heat capacities of iron, tin and bismuth are: 0.45 J/g °C, 0.213 J/g °C and 0.123 J/g °C.

This follows from the decreasing densities of the metals in the order; iron > tin > bismuth.

Hence iron has the greatest heat capacity among the three elements.

Learn more: https://brainly.com/question/1453843

Answer:

I- It says horizon so.....what....wth ._.

Explanation:

Answer:

1.022ppm is the unknown concentration of the metal

Explanation:

Based on Lambert-Beer law, the increasing in signal of a detector is directly proportional to its concentration.

The unknown concentration (X) produces a signal of 0.255

99mL * X + 1mL * 100ppm / 100mL produces a signal of 0.502

0.99X + 1ppm produce 0.502, thus, X is:

0.255 * (0.99X + 1 / 0.502) =

X = 0.503X + 0.508

0.497X = 0.508

X =

1.022ppm is the unknown concentration of the metal

Answer:

k

Explanation:

Answer:

91.224 mg of caffeine will be extracted from a 60 mL cup of Turkish coffee (100 mg caffeine) by 40 mL of methylene chloride (CH2Cl2)

Explanation:

The distribution co-efficient of Caffeine for methylene chloride (CH2Cl2)/water (H2O) is   8.4

Volume of Turkish coffee = 60 mL

Volume of methylene chloride (CH2Cl2) = 40 ml

Distribution coefficient is represented by K

[tex]8.4 = \frac{\frac{X}{60}}{\frac{100-X}{50} } \\X = 91.224[/tex] mg

Answer:

If kept in Celsius: 0.15 L

If kept in Kelvin: 0.89 L = 0.90 L

Explanation:

This formula can be remembered by just remembering the ideal gas law formula, PV=nRT

P= pressure, V= volume, n= moles, R=constant, and T= temperature.

Let's take away what is constant, particles/moles, pressure, and R.

so what we have is P=T -> [tex]\frac{V}{T}[/tex] =x, we want to know how it changes though so we can say that [tex]\frac{V1}{T1} = \frac{V2}{T2}[/tex]. Where P1 and T1 are for the air in your lungs that you expel, the P2 and T2 is the air now in your surroundings after you exhale.

Let's plug it in and solve for V2.

[tex]\frac{1 L}{37 C} = \frac{V2}{5.6}[/tex]

[tex]\frac{(1 L x 5.6 C)}{37 C} =[/tex] V2

0.15 L = V2

Answer:

Its right you dont have to change anything

Answer:

If capital R is round, than the RR and Rr will mean round, and the two rr's are wrinkled. that means the answer to both is 50%

Explanation:

hope that helps

Answer: Oxidation reaction:  [tex]Al(s)\rightarrow Al^{3+}(aq)+3e^-[/tex]

Reduction reaction:  [tex]Sn^{2+}(aq)+2e^-\rightarrow Sn(s)[/tex]

Overall redox reaction : [tex]2Al(s)+3Sn^{2+}(aq)\rightarrow 2Al^{3+}(aq)+3Sn(s)[/tex]

Explanation:

Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.

Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.

[tex]Al(s)\rightarrow Al^{3+}(aq)+3e^-[/tex]

Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.

[tex]Sn^{2+}(aq)+2e^-\rightarrow Sn(s)[/tex]

Overall redox reaction : [tex]2Al(s)+3Sn^{2+}(aq)\rightarrow 2Al^{3+}(aq)+3Sn(s)[/tex]

Answer:

I believe the answer is 3. Carbonic acid has 3 more atoms than water.

Explanation:

Because water has 3 atoms and I think Carbonic acid has 6 so 6-3=3.

Answer:

When sodium hydroxide react with sulphuric acid they form Sodium sulphate and water. The reactants is base and an acid, which leads to neutralization process and yields a salt .

Answered by The One and only #Queen

Answer:

water is an example of mixture

Answer:

I think its 3.6 to the right

Explanation:

I apologize if im wrong

Answer:

Hello There!!

Explanation:

The answer is=>a. Gibbs.

hope this helps,have a great day!!

~Pinky~

[tex]\huge{\textbf{\textsf{{\color{navy}{An}}{\purple{sw}}{\pink{er}} {\color{pink}{:}}}}}[/tex]

a. Gibbs

Answer:

Basically, fragrances reach other person through sense of smell. So, the strength of the fragrances depends a lot on its evaporation, which is strongly related to the boiling point. Esters with higher molecular weight do not have a strong fragrance because it has a higher boiling point.

Answer:

Weaker attraction between its molecules than the green substance. It's molecules now move away from each other.

Explanation:

Liquid to gas.

The pink substance should be weaker attraction between its molecules than the green substance. It's molecules now move away from each other.

The following information should be considered:

Learn more: brainly.com/question/17429689

Answer:

1

Explanation:

........................

Cr2Na2O7

Sodium Dichromate