How many moles of calcium phosphate are in 1.0 x 10-3 g calcium phosphate? a) 0.310 b) 0.008 c) 8 d) 1.94 x 1018 e) 3.22 x 10-6

1 Answer
anor277
Nov 4, 2017

We use the quotient #"moles of stuff"="mass of stuff"/"molar mass of stuff"#

Explanation:

And we know that the molar mass of calcium phosphate, #Ca_3(PO_4)_2# (if this is what we got)....#310.3*g*mol^-1#

And so moles of #"calcium phosphate"=(1xx10^-3*g)/(310.3*g*mol^-1)# #=3.22xx10^-6*mol#...

So which option is consistent with this answer?

Note that most of the time, when we isolate phosphates, we isolate the #"biphosphate"#, i.e. salts of #HPO_4^(-)#....in this question the answer is non-ambiguous.....

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