Chemistry, 02.01.2020 19:31 danielzgame

Acompound is composed of 85.64% carbon and 14.36% hydrogen. the compound has a formula mass of 42.08 grams. what is the molecular formula?

Answers: 1

Show answers

Answers

Answer from: bob5266

The molecular formula is C₃H₆

Explanation:

1) Assume 100 g of substace:

Carbon, C: 85.64% × 100 g = 85.64 gHydrogen, H: 14.36% × 100 g = 14.36 g

2) Convert the masses in grams to number of moles

moles = mass in grams / atomic massatomic mass of C: 12.011 g/molatomic mass of H: 1.008 g/mol

Calculations:

C: 85.64 g / 12.011 g/mol = 7.130 molH: 14.36 g / 1.008 g/mol = 14.25 mol

3) State the ratio of moles.

Divide the number of moles of each element by the least number of moles:

C: 7.130 mol / 7.130 mol = 1.0 molH: 14.25 mol / 7.130 mol = 2.0 mol

4) Set the empirical formula:

CH₂

5) Calculate the mass of one mol of the empirical formula:

CH₂: 12.011 g/mol + 2× 1.088 g/mol = 14.027 g/mol

6) Calculate how many times the mass of the empirical formula is contained in the mass of the molecular formula:

42.08 g / 14.027 g = 2.9999 = 3

7) Set the molecular formula:

Multiply each subscript of the empirical formula by the previos ratio: 3

C: 1 × 3 = 3H: 2 × 3 = 6

Conclusion: the molecular formula is C₃H₆

Answer from: yentel110306

C₃H₆

Explanation:

Answer from: Quest

answer : (a) volume of the gas = 8.67 × $10^{-3}$ l

(b) second virial coefficient b = -1.21226 l/mole

solution : given, t = 300k

p = 20atm

z = 0.86

n = 8.2 mmoles = 8.2 × $10^{-3}$ moles

r = 0.082 l atm/k/mol

find, (a) volume of gas and (b) second virial coefficient b at 300k.

formula used : $z=\frac{pv}{nrt}$

and $z=1+\frac{b}{v}$

(a) $z=\frac{pv}{nrt}$

$v=\frac{znrt}{p}$

= $\frac{0.86\times 8.2\times[tex]10^{-3}$ \times 0.082\times 300}{20}[/tex]

= 8.67 × $10^{-3}$ l

(b) $z=1+\frac{b}{v}$

$b=(z-1)v$

= (0.00867-1) × 8.659

= - 8.5839 l/mole

Answer from: Quest

b.false that your answer

Another question on Chemistry

Chemistry, 22.06.2019 06:00

When would a bouncy ball have the most potential energy

Answers: 2

Answer

Chemistry, 22.06.2019 13:30

What does the xylem do? stores the glucose captures the sunlight absorbs oxygen into the leaf carries water from the roots to the leaves

Answers: 1

Answer

Chemistry, 22.06.2019 15:40

Use the periodic table to complete this equation that represents nuclear fission processesun - ba c 3 n

Answers: 2

Answer

Chemistry, 22.06.2019 18:00

What amount of heat is exchanged when 106.2 grams of substance y goes from a liquid at 35 degrees celsius to a solid at the same temperature? melting point of substance y = 35 degrees c; δhvaporization = 3.67 j/mol; δhfusion = 3.30 j/mol. mwsubstance y = 28.22 g/mol. −12.4 j −3.51 x 102 j 1.24 x 101 j 351 j

Answers: 1

Answer

You know the right answer?

Acompound is composed of 85.64% carbon and 14.36% hydrogen. the compound has a formula mass of 42.08...

Questions