Answer:
Question 5: 127.2
The molar ratio between CH4 and C is 1:1
10.6 x 12 = 127.2 grams
Question 10: 5.9
The molar ratio between H(NO3) and Mg(NO3)2 is 2:1
5/63 = 0.0794 moles of H(NO3)
(.0794 / 2) x 1 = 0.0397 moles of Mg(NO3)2
.0397 x 148 = 5.9 grams of Mg(NO3)2
Question 6: 14.0
The molar ratio between CuO and N2 is 3:1
118.1 / 78.5 = 1.504 moles of CuO
(1.504 / 3) x 1 = .501 moles of N2
.501 x 28 = 14.0 grams of N2