1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vlad [161]
2 years ago
15

A 3.76 g sample of a compound consisting of carbon, hydrogen, oxygen, nitrogen, and sulfur was combusted in excess oxygen. This

produced 4.06 g CO 2 and 2.22 g H 2 O . A second sample of this compound with a mass of 5.69 g produced 3.73 g SO 3 . A third sample of this compound with a mass of 8.53 g produced 4.40 g HNO 3 . Determine the empirical formula of the compound. Enter the correct subscripts on the given chemical formula.?
Chemistry
1 answer:
boyakko [2]2 years ago
8 0

Answer: The empirical formula is C3H8S2NO.

Explanation: To determine the formula, find the porcentage of mass of each element in the sample:

1) For C (Molar Mass = 12u)

Note: molar mass of CO2 = 44g/mol

1 mol of CO2 = \frac{4,06}{44} = 0,092g/mol

In 1 mol of CO2, 1 mol of C, so mass of C is

mC = 0,092 . 12 = 1,104g

\frac{mC}{msample} . 100 = \frac{1,104}{3,76} . 100 = 29,4%

2) For H (Molar Mass = 1u)

Note: molar mass of H20 = 18g/mol

1 mol of H2O = \frac{2,22}{18} = 0,124 g/mol

In 1 mol of H2O, 2 mols of H, so mass is

mH = 0,124 . 2 . 1 = 0,248g

\frac{mH}{msample} . 100 = \frac{0,248}{3,76} . 100 = 6,6%

3) For S (Molar Mass = 32u)

Note: molar mass of SO3 = 80g/mol

1 mol of SO3 = \frac{3,73}{80} = 0,046g/mol

In 1 mol of SO3, 1 mol of S, so its mass is:

mS = 0,046 . 32 = 1,472g

\frac{mS}{msample} . 100 = \frac{1,472}{3,73} . 100 = 39,5%

4) For N (Molar Mass = 14u)

Note: molar mass of HNO3 = 63g/mol

1 mol of HNO3 = \frac{4,40}{63} = 0,07

In 1 mol of HNO3, 1 mol of N, so the mass is

mN = 0,07 . 14 = 0,98g

\frac{mN}{msample} . 100 = \frac{0,98}{8,53} . 100 = 11,5%

5) For O (Molar Mass = 16u).

O = 100% - (29,4%+6,6%+39,5%+11,5%)

O = 13%

It's determined the porcentage of the composition. Assuming that 100g of the compound, we calculte the mols of each:

Carbon = \frac{29,4}{12} = 2,45 mol

Hidrogen = 6,6 mol

Sulfur = 1,25 mol

Nitrogen = 0,82 mol

Oxygen = 0,81 mol

Divide each by 0,81, the empirical formula of the compound  is C3H8S2NO

You might be interested in
How many moles is 17.6 g NaOH?
Lynna [10]

Answer:

\boxed {\boxed {\sf D. 0.440 \ mol \ NaOH}}

Explanation:

To convert from moles to grams, the molar mass is used (mass of 1 mole). The values are the same as the atomic masses on the Periodic Table, but the units are grams per mole (g/mol) instead of atomic mass units.

<h3>1. Molar Mass</h3>

We are given the compound sodium hydroxide (NaOH) and we need to look up the molar masses of the individual elements.

  • Na:  22.9897693 g/mol
  • O: 15.999 g/mol
  • H: 1.008 g/mol

The formula for the compound has no subscripts, so there is 1 mole of each element in 1 mole of the substance. We can simply add the molar masses.

  • NaOH: 22.9897693 + 15.999 + 1.008 = 39.9967693 g/mol

This means there are 39.9967693 grams of sodium hydroxide in 1 mole.

<h3>2. Convert Grams to Moles </h3>

Use the molar mass we found as a ratio.

\frac {39.9967693 \ g \ NaOH}{ 1 \ mol \ NaOH}

Since we are converting 17.6 grams of NaOH to moles, we multiply by this value.

17.6 \ g\ NaOH *\frac {39.9967693 \ g \ NaOH}{ 1 \ mol \ NaOH}

Flip the ratio so the units of grams of NaOH cancel.

17.6 \ g\ NaOH *\frac {1 \ mol \ NaOH}{ 39.9967693 \ g \ NaOH}

17.6 *\frac {1 \ mol \ NaOH}{ 39.9967693}

\frac{17.6 }{ 39.9967693} \ mol \ NaOH

0.4400355406 \ mol \ NaOH

<h3>3. Round </h3>

The original measurement of grams has 3 significant figures, so our answer must have the same. For the number we calculated, that is the thousandth place.

  • 0.4400355406

The 0 in the ten thousandths place (in bold above) tells us to leave the 0 in the thousandth place.

0.440 \ mol \ NaOH

17.6 grams of sodium hydroxide are equal to <u>0.440 moles of sodium hydroxide.</u>

3 0
3 years ago
Por qué razón se fomenta la inmigración Europea?​
Morgarella [4.7K]

Hola aquí va la respuesta!

Se fomentó la inmigración europea porque la economía no era buena y vinieron a Paraguay para mejorar su situación.

8 0
2 years ago
Read 2 more answers
Can you use volume to measure out a mole of a gas? Why or why not?
Rashid [163]

The volume of a gas is defined by the volume of its container.  

However, given the number of moles, and standard temperature and pressure, you can use the Ideal Gas Law to calculate the volume.

8 0
3 years ago
A compound is broken down into 34.5 g of element a, 18.2 g of element b, and 2.6 g of element
Katena32 [7]
First, find the total mass.

34.5 g + 18.2 g + 2.6 g = 55.3 g

Divide the mass of each element by total mass.

34.5 g / 55.3 g = .62 x 100 = 62% element a

18.2 g / 55.3 = .33 x 100 = 33% element b

2.6 g / 55.3 = .047 x 100 = 4.7% element c

Hope I helped!


8 0
3 years ago
Convert 29.85 degree Celsius to Kelvin
Vlad [161]

Answer:

its 303 Kelvin. (typing this for characters)

4 0
3 years ago
Other questions:
  • Consider a balloon that has a volume V. It contains n moles of gas, it has an internal pressure of P, and its temperature is T.
    13·2 answers
  • The carbon atom in co2 shares _______blank electron pairs. after the reaction with h2o to form h2co3 is completed, the carbon at
    6·2 answers
  • . A ________________ is formed when two or more ______electrons____ bond by a covalent bond.
    13·1 answer
  • Oil floats on the surface of water but mercury sinks. why?​
    8·1 answer
  • How does a hydra move?....In short form​
    8·2 answers
  • [AZ][B]^4=K
    11·1 answer
  • HELPPPPPPP!!!!!!!!!!
    13·2 answers
  • What is the difference between a halogen and a halide?<br><br> need help urgently!
    15·2 answers
  • Someone please helpppp!!!!!!Question 7
    12·1 answer
  • Which ion has a smaller size,1)N---,O--,F-and Ne 2) Cl-,Br- and I ?Why<br> Help me to solve it!
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!