Question

What is the mass of 2.5 mol of methane ?

Answer 1

Answer:

Let mass be x

Molecular mass=16

2.5=x/16

x=2.5/10×16=40answer

Explanation:

Answer 2

Given:

2.5 moles of methane

To Find:

The mass of 2.5 moles of methane

Solution:

The mass of 2.5 moles of methane is 40g.

We know that,

The number of moles of a substance = Mass of the sample / Molar mass of the substance

The atomic mass of hydrogen and caron is 1u and 12u respectively.

Since methane has the formula CH₄

⇒ Its molar mass = 12 X 1 + 1 X 4

= 12 + 4

= 16g

Substituting,

2.5 = m / 16

or m = 2.5 X 16

= 40g