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[From: ] [author: ] [Date: 12-01-13] [Hit: ]
99 g = 2 g + 15.99 g = 17.For partial credit show your work like the example above.MnPb8(Si2O7)3 _______________________…-Ag: (107.Cl: 3(35.45)=106.......
4 . Using the periodic table, find the molar mass (in grams) of each compound:

Ex: Find the molar mass of H20
2 H atoms + 1 O atom = 2(1.00 g) + 15.99 g = 2 g + 15.99 g = 17.99 g

For partial credit show your work like the example above.


AgCl3Cu2 ____________________________…

Ba(AsO4)2 ___________________________…

(NH4)3PO4 ___________________________…

MnPb8(Si2O7)3 _______________________…

-
Ag: (107.9)
Cl: 3(35.45)=106.35
Cu: 2(63.55)=127.1
Answer: 341.35 g/mol

Ba: (137.3)
As: 2(74.92)=149.84
O: 8(16)=128
Answer: 415.14 g/mol

N: 3(14.01)=42.03
H: 12(1.008)=12.096
P: 30.97
O: 4(16)=64
Answer: 149.096

Mn: 54.94
Pb: 8(207.2) =1657.6
Si: 6(28.09) =168.54
O: 21(16) =336
Answer: 2217.08

What you do is multiply how many of each element there are in the compound (for example in the first one there is 1 Ag, 3 Cl's, and 2 Cu's) by its atomic mass, which is found on the periodic table under the elements symbol (Ag, Cl, Cu). and then add them up. also the unit for all the answers are g/mol (grams per mole) if you need to know that. hope that helped!
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