Question

.What is the mass of 4 moles of hydrogen gas? *
8.064g
4.032g
1g
1.008​

Answer 1

Answer:

4.032

Explanation: mass of one mole of any atom/molecule is equal to its atomic/molecular mass. Hence, mass of 4 moles of hydrogen will be

4*1.008=4.032

Answer 2

Given:

Moles present in hydrogen gas = 4

To find:

Mass of 4 moles of hydrogen = ?

Formula to be used:

m = M × n

Where,

m - Mass

M - Molecular mass

n - Number of moles

Solution:

Step 1 of 2

Find the molecular mass of hydrogen gas:

The molecular mass of H = 1.00784

The molecular mass of hydrogen gas $(H_{2} )$ = 2 × 1.00784

The molecular mass of hydrogen gas $(H_{2} )$ = 2.01568 g

Step 2 of 2

Substitute the given and obtained values in the formula

m = M × n

m = 2.01568 × 4

m = 8.06272

m = 8.064

Final answer:

The mass of 4 moles of hydrogen gas $(H_{2} )$  is 8.064 g.