Question

The chemical equation below shows the decomposition of ammonium nitrate (NH4NO3).

NH4NO3 -> N2O + 2H2O

A chemist who is performing this reaction starts with 160.1 g of NH4NO3. The molar mass of NH4NO3 is 80.03 g/mol; the molar mass of water (H2O) is 18.01 g/mol. What mass, in grams, of H2O is produced?

A)9.01
B)18.01
C)36.03
D)72.06

Answer 1

Explanation: Edge 2023

Answer 2

The mass in grams of H₂O is 72.04 grams which is around (answer D)

Calculation

Step 1 : calculate the moles of NH₄NO₃

moles = mass/molar mass

=160.1 g / 80.03 g /mol = 2 moles

Step 2: use the mole ratio to calculate the moles of H₂O

NH₄NO₃:H₂O is 1:2 therefore the moles of H₂O is

= 2 moles x 2 = 4 moles

Step 3: calculate the mass of H₂O

mass = moles x molar mass

= 4 moles x 18.01 g/mo= 72.04 grams approximate (answer D)