It was found that 0.015 moles of atoms of an element had a mass of 2.88g. What is the relative atomic mass of the element?

Given the following relative atomic masses: H = 1, O = 16 and Al = 27, calculate the relative formula mass of aluminium hydroxide

Given the following relative atomic masses: H = 1, N = 14, O = 16 and S = 32; calculate the relative formula mass of ammonium sulphate

Given the atomic masses: Cu = 64, S = 32 and O = 16; calculate the % by mass of sulphur in copper(II) sulphate

If 40g of calcium combines with 160g of bromine, what is the formula of calcium bromide? (Relative atomic masses: Ca = 40 and Br = 80)

In an experiment, excess chlorine was passed over 27g of heated aluminium metal until all the metal had reacted. If 133.5g of white aluminium chloride was formed work out the formula of aluminium chloride. (Relative atomic masses: Al = 27 and Cl = 35.5)

Given the equation for the thermal decomposition of calcium carbonate (limestone) ...

CaCO_3(s) ==> CaO_(s) + CO_2(g)

What mass of limestone in g, on strong heating, will form 120 cm³ carbon dioxide? (A_r's Ca=40, C=12, O=16, 1 mol gas = 24 dm³ at room temp./press.)

The combustion of propane is given by the equation:

C₃H_8(g) + 5O_2(g) ==> 3CO_2(g) + 4H₂O_(l)

What volume of carbon dioxide in dm³ is formed by burning 30dm³ of propane?

A lithium compound consisted of 7g of lithium combined with 16g of sulphur and 32g of oxgen. What is the empirical formula of the compound?

(relative atomic masses, A_r: Li = 7, S = 32, O = 16)

A iron-copper sulphide ore consisted of 30.5% iron, 34.6% copper, and 34.9% sulphur. What is the empirical formula of the ore?

(relative atomic masses, A_r: Fe = 56, Cu = 63.5, S = 32)

A hydrocarbon consisted of 92.3% carbon and 7.7% hydrogen. If its molecular mass is 78, work out its molecular formula.

(relative atomic masses, A_r: C = 12, H = 1)

The salt zinc chloride can be made by dissolving zinc carbonate in dilute hydrochloric acid.

ZnCO_3(s) + 2HCl_(aq) ==> ZnCl_2(aq) + H₂O_(l) + CO_2(g)

Given the atomic masses: Zn = 65, C = 12, O =16, H = 1, Cl =35.5, what mass of zinc chloride in g can be made from 25g of zinc carbonate? [rmc-16]