1. Sodium chlorate is heated to form sodium chloride and oxygen. The mass of the

Question

1. Sodium chlorate is heated to form sodium chloride and oxygen. The mass of the dry, empty crucible and cover is 24.6382 grams. The mass of the crucible, cover and sodium chlorate is 29.7320 grams. After the sodium chlorate is repeatedly heated, the constant mass of the crucible, cover and residue is 27.4352 grams a) Determine the mass of the sodium chlorate sample a) b) Determine the mass of the residue remaining at constant mass b) c) Find the mass of the oxygen driven off c) d) Calculate the percent oxygen in this compound d)

Explanation / Answer

a) mass of sodium chlorate = 29.7320 - 24.6382 => 5.0938 g

b) mass of residue remaining at constant mass = 29.7320 - 27.4352 => 2.2968 g

c) mass of oxygen = 5.0938 - 2.2968 => 2.797 g

d) % of oxygen = ( 2.797 / 5.0938) x 100 => 54.9 % or 55 %

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