Question

The mass % of C in methane CH4 is a) 74.87 b) 7.743 c) 133.6 d) 25.13 €) 92.26 159

Answer 1

a) 74.87 % carbon

Step-by-step explanation:

Molecular mass of CH₄ is 16.042 g / mole.

Now we divide the following reasoning for 1 mole of methane:

if in 16.042 g of CH₄ there are 12.01 g of carbon

then in 100 g of CH₄ there are X g of carbon

X = (100 × 12.01) / 16.042= 74.87 % carbon