Please need to make sure my answers are correct. There are two. Please print, it

Question

Please need to make sure my answers are correct. There are two. Please print, it is easier for me to see. Thank you in advance

1. Calculate the number of moles of silver present in a 10.35 g sample. Report your answer to the appropriate number of significant figures.

2. 6 mL of 1.0M CuSO4(aq) is mixed with 8 mL of 1.0 M Na2S(aq) to produce 0.250 g CuS, a black precipitate. The balanced chemical equation for this reaction is: CuSO4 + Na2S à CuS + Na2SO4.

a. What is the limiting reactant in this reaction?

b. Calculate the theoretical (maximum yield) of CuS in grams.

Explanation / Answer

1)

Molar mass of Ag = 107.9 g/mol


mass(Ag)= 10.35 g

use:
number of mol of Ag,
n = mass of Ag/molar mass of Ag
=(10.35 g)/(107.9 g/mol)
= 9.59*10^-2 mol
Answer: 9.59*10^-2 mol

I am allowed to answer only 1 question at a time

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