If 1.123 g strip of Cu is used for the reaction? How many moles of Cu...

Question

Question

science chemistry

Answer 1

Answer #1

(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

Answer 2

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