Can someone please solve this three questions for me. Thank you for your help. (1)- in an experiment, 5g of copper was heated with excess sulphur yield 3g of copper (1)sulphide. what is the percentage yield?

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Answer 1 · 2017-07-03T22:11:52

30%

Mass: S= 32g , Cu= 63.5g ... #Cu_2S#=127g

practical product = 3g of #Cu_2S#

#2Cu + S -> Cu_2S#

63.5g --- 127g
#color(white)d# 5g#color(white)d# --- x

#"127 * 5"/63.5 = 10g# --> theoretical product

Percentage yield:

#"practical product"/"theoretical product"*100#

#"3g"/"10g"*100=30%#