Semester Practice Answers

1)
Al2O3 + 6K
3K2O + 2Al
2)
CH4 + 2O2  CO2 + 2H2O
3)
Dinitrogen pentoxide
4)
NiP
5)
4.50 X 1022 formula units of Al2(CO3)3
6)
C4H2O
7)
C3H8O2
8)
A)
LR – AgNO3 (found molar mass of AgNO3 to be 169.872g)
ER – MgCl2
B)
6.73 g of MgCl2 are consumed during the reaction
84.1 g of MgCl2 remain after the reaction is complete
(empirical formula = C3H8O2, too!)
(Found the molar mass of MgCl2 to be 95.211 g)
C)
20.2 g AlCl (found molar mass of AlCl to be 143.321 g)
D)
4.25 X 1022 formula units Mg(NO3)2
E)
93.3% (found molar mass of Mg(NO3)2 to be 148.313 – calc = 10.5 g)
F)
30.7 g
G)
114.8 g
H)
114.8 g (84.1 g excess remaining, 30.7 g products)