A completed reaction yields 38 moles of Ag from the equation below. How much Cu did the equation start with?

Question

Cu + AgNO3 → Ag + Cu(NO3)2

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Answer 1 · 2018-03-17T18:24:23

#19 "mol Cu"#

Step 1: Write a balanced equation
#Cu + 2AgNO_3 → 2Ag + Cu(NO_3)_2#

Step 2: Stoichiometry
#38 cancel("mol Ag") * (1"mol Cu")/(2 cancel("mol Ag") #=

#19 "mol Cu"#

Here's the deal, since they said "how much" of Cu was used, and no specific unit was given, we report the answer in the unit of Ag