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)
