M2S3 – Moles


75

Moles

1 / 10

What is the molar mass of calcium hydroxide?

2 / 10

How many moles of molecules are there in 0.240 g bromine?

3 / 10

What is the mass of 0.00400 mol of sodium hydrogensulfate?

4 / 10

How many sulfate ions are there in 0.01 mol aluminium sulfate?

(The Avogadro constant = 6.02 x 1023 mol-1)

5 / 10

What is the empirical formula of an oxide of sodium which contains 74.2% sodium?

6 / 10

What is the molecular formula of a hydrocarbon which consists of 82.8% carbon and has a relative molecular mass estimated in the range 50 and 60.

7 / 10

Calculate the theoretical yield of ethyl ethanoate, CH3CO2C2H5, when 6.9 g ethanol, C2H5OH, reacts with excess ethanoic acid, CH3CO2H.

8 / 10

Calculate the volume of oxygen gas formed on strongly heating 3.40 g sodium nitrate which decomposes according to this equation:

2NaNO3(s) -> 2NaNO2(s) + O2(g)

Assume that the volume of 1 mol of any gas is 24 000 cm3 under the conditions of the experiment.

9 / 10

Sodium hydride reacts with water:

NaH(s) + H2O(l) -> NaOH(aq) + H2(g)

What is the concentration of a solution of sodium hydroxide formed when 0.600 g sodium hydride reacts with water and the solution is diluted to 100 cm3?

10 / 10

A 20.0 cm3 sample of barium hydroxide solution, Ba(OH)2(aq), was neutralised by exactly 18.0 cm3 of 0.10 mol dm-3 hydrochloric acid, HCl(aq). What was the concentration of the barium hydroxide solution?

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