Respuesta :
Answer:
62.98 % of the sample of hydrate is water
Explanation:
Step 1: Data given
Mass of the sample of a hydrate of sodium carbonate (Na2CO3) = 2.026 grams
After heating, the mass of the sample is 0.750 g
Molar mass H2O = 18.02 g/mol
Step 2: Calculate mass of water
Mass water = mass of hydrate - mass of sample after heating
Mass water = 2.026 grams - 0.750 grams
Mass water = 1.276 grams
Step 3: Calculate mass % percent of water
Mass % of water = (mass of water / total mass hydrate) * 100 %
Mass % of water = (1.276 grams / 2.026 grams) *100 %
Mass % of water = 62.98 %
62.98 % of the sample of hydrate is water
Answer:
percentage mass of water = 62.98%
Explanation:
The reaction is a decomposition reaction whereby hydrate of sodium carbonate was heated to remove water . The actual weight of the hydrated compound is 2.026 grams . After heating, the mass of the sample was now 0.750 grams. The percentage of the water sample can be calculated as follows:
total mass of hydrated sample = 2.026 grams
mass of sample after heating = 0.750 grams
mass of water removed = 2.026 - 0.750 = 1.276 grams
percentage mass of water = mass of water/mass of hydrated compound × 100
percentage mass of water = 1.276/2.026 × 100
percentage mass of water = 127.6/2.026
percentage mass of water = 62.9812
percentage mass of water = 62.98%
