Chemistry
Sample of impure magnesium is reacted with dilute sulphuric acid to give the respective salt and hydrogen. If 1 g. of the impure sample gave 298.6 cc. of hydrogen at s.t.p. Calculate the % purity of the sample. [Mg = 24, H = 1].
Related Questions
Sodium carbonate reacts with dil. H2SO4 to give the respective salt, water and carbon dioxide. Calculate the mass of pure salt formed when 300 g. of Na2CO3 of 80% purity reacts with dil. H2SO4. [Na = 23, C = 12, O = 16, H = 1, S = 32].
Sulphur burns in oxygen to give sulphur dioxide. If 16 g. of sulphur burns in 'x' cc. of oxygen, calculate the amount of potassium nitrate which must be heated to produce 'x' cc. of oxygen. [S = 32, K = 39, N = 14, O = 16].
67.2 litres of H2 combines with 44.8 litres of N2 to form NH3 :
N2(g) + 3H2(g) ⟶ 2NH3(g).
Calculate the vol. of NH3 produced. What is the substance, if any, that remains in the resultant mixture ?
What volume of oxygen is required to burn completely 90 dm3 of butane under similar conditions of temperature and pressure?
2C4H10 + 13O2 ⟶ 8CO2 + 10H2O