Homework Answers
(1) Number of moles of Cu , n = mass/molar mass
= 1.123 g / (63.5 g/mol)
= 0.0180 moles
(2) The amount of mass gained = final mass - initial mass
= 1.345 - 1.123 g
= 0.222 g
The added element was sulphur
(3) The number of moles of sulphur reacted , n = mass / molar mass
= 0.222 g / ( 32 g/mol)
= 6.940x10-3 moles
(4) Endothermic reaction is the one where energy/heat is absorbed by the system
where as in exothermic reaction heat energy will be released by the system
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