Question

what is mass of 3.011×10^23 molecule of CH4

Answer 1

Atomic mass = CH4
= 12×1 + 1×4
= 16u.

Mass of 1 mole = 16 gram.
6.022 × 10²³ = 16
m = 16/2
= 8 gram.

Answer 2

Given: $3.011×10^{23}$ molecules of methane.

To find: We have to find the mass.

Solution:

The chemical formula of methane is $CH_4$.

The atomic mass of C is 12 and the atomic mass of H is 1 amu.

Thus, the molecular mass of methane is 1×4+12=16 amu.

Thus $6.022×10^{23}$ number of molecules of methane has a mass of 16amu.

Thus $3.011×10^{23}$ number of molecules of methane has a mass of $3.011×10^{23}/6.022×10^{23}×16=8$ units.

Thus the mass of $3.011×10^{23}$ molecules of methane is 8 grams.