Question

The number of moles of CH4 which contains 3g of Carbon
a)1 mole
b)0.5
c)0.75
d)0.25​

Answer 1

Carbon's atomic mass is 12.011 g/mol while hydrogen's atomic mass is 1.008 g/mol. The molar mass of methane, therefore, is (12.011*1) + (1.008*4), which equals 16.043 g/mol. Now, we can convert the grams of CH4 to moles by dividing 7 by 16.043, which equals 0.436 moles CH4.