Question

How many liters of hydrogen gas are formed from 15.7g of carbon? Assume the hydrogen gas is collected at a pressure 1.0atm and a temperature of 355K.

C(s) + H₂O (g) → CO(g) + H₂ (g)

Answer 1

Molar mass of C = 12.01 g/mol

mass of C = 15.7 g

mol of C = (mass)/(molar mass)

= 15.7/12.01

= 1.3072 mol

From balanced chemical reaction, we see that

when 1 mol of C reacts, 1 mol of H2 is formed

mol of H2 formed = moles of C

= 1.3072 mol

we have:

P = 1.0 atm

n = 1.3072 mol

T = 355.0 K

we have below equation to be used:

P * V = n*R*T

1 atm * V = 1.3072 mol* 0.08206 atm.L/mol.K * 355 K

V = 38.1 L

Answer: 38.1 L