Question

How many molecules (not moles) of nh3 are produced from 8.95×10−4 g of h2?

Answer 1

1.8 x 10²³molecules

Step-by-step explanation:

Given parameters:

Mass of H₂ = 8.95 x 10⁻⁴g

Unknown:

Number of molecules of NH₃ = ?

The equation of the reaction: N₂ + 3H₂ ⇄ 2NH₃

To solve this problem:

• We work from the known to the unknown. We know the mass of the hydrogen gas given so we find the number of moles using the equation below:

Number of moles of H₂ =
`(mass)/(molar mass)`

Number of moles =
`(0.000895)/(2)`

Number of moles = 0.00045mol

• From the balanced reaction equation, we can determine the number of moles of NH₃ produced:

3 moles of H₂ produced 2 moles of NH₃

0.00045mol of H₂ yields 0.000299mol of NH₃

To find the number of molecules of NH₃ produced, we use the expression below:

Number of molecules = number of moles x 6.02 x 10²³

Number of molecules of NH₃ = 0.000299 x 6.02 x 10²³ =

1.8 x 10²³molecules