The mole concept and related calculations questions | form three Chemistry

Define the following:
(i) Mole.
(ii) Molar mass.

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UNSOLVED

112 dm³ of oxygen gas was collected at s.t.p. When a sample of lead nitrate was completely decomposed by heat. Calculate the volume of nitrogen dioxide gas produced.

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Three moles of nitrogen gas combined with five moles of hydrogen gas to form ammonium gas by the Haber process
(a) Which reactant is present in smaller amount?
(b) Calculate the grams of the reactant left in the container.
(c) How many moles of are produced?
(d) How many litres of are produced at STP?

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 How many chlorine molecules are in 20 cm​ 3​ of chlorine gas at s.t.p.?
 

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Calculate the number of ions present in 5 g of copper II nitrate.

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UNSOLVED