Question

How many grams are there in 9.6 x 1025 molecules of H2? Round your final answer to two decimal places.

Answer 1

Moles of H_2

`\\ \rm\Rrightarrow (No\:of\: molecules)/(Avagadro\:no)`

`\\ \rm\Rrightarrow (9.6* 10^(25))/(6.023* 10^(23))`

`\\ \rm\Rrightarrow 1.594* 10^(2)`

`\\ \rm\Rrightarrow 159.39mol`

Mass

`\\ \rm\Rrightarrow Moles* molar\:mass`

`\\ \rm\Rrightarrow 159.39(2)`

`\\ \rm\Rrightarrow 318.78g`

Answer 2

there are 310.64 grams in 9.40×10²⁵ molecules of H₂.

Step-by-step explanation:

Amount of moles of H₂= (9.6 × 10²⁵ atoms × 1 mole) ÷ 6.023 × 10²³ atoms

amount of moles of H₂ = 155.32 moles

On the other hand, molar mass is the amount of mass that a substance contains in one mole. In this case, the molar mass of H₂ is 2 .

Then the mass that 155.32 mole of compound contains is calculated as:

155.32 moles × 2 = 310.64 grams

Finally, there are 310.64 grams in 9.40×10²⁵ molecules of H₂.