Question

what is the mass of 3 mol of helium atoms?

Answer 1

$the \: mass \: of \: one \: mole(molar \: mass) \\ of \: helium \: gas \: is \: 4.002602g \mol.$

Answer 2

Given:

3 mole of Helium

To find:

Mass of 3 mole of helium = ?

Formula to be used:

$m=$ $M$ × $n$

Where,

m - Mass

M - Molecular mass

n - number of moles

Calculation:

Step 1 of 2

Find the molecular mass of Helium

Molecular mass of Helium = 4.002602 g/mol

Step 2 of 2

Find the mass

$m=$ $M$ × $n$

$m=$ $\[4.002602\times 3\]$

$m=12.007806$

Final answer:

The mass of 3 mole of helium atoms is 12.007806 g.