Answer: x=18
Step-by-step explanation:
Hydrogen and oxygen reacts according to the following equation:
2H2 + O2 → 2H2O
First, we must find the mass of hydrogen and oxygen in the equation.
Finding mass of hydrogen
number of mol = mass/Mr
2 =mass/2
mass = 4g
Finding mass of oxygen
number of mol = mass/Mr
1=mass/16
mass = 16g
Finding mass of water
number of mol = mass/Mr
2=mass/18
mass = 36g
4g of H2 reacts with 16g of O2
2g of H2 reacts with 16/4 × 2 = 8g of O2
(I did this step to ensure that there are no reagent in excess)
4g of H2 forms 36g of H2O
2g of H2 forms 36/4 ×2 = 18g of H2O