Homework Help: chemistry

Posted by bre bre on Sunday, March 8, 2009 at 7:50pm.

Determine the number of moles of each specified atom or ion in the given samples of the following compounds.( Hint: the formula tells you how many atoms or ions are in each molecule of formula unit.)

a. O atom in 3.161x10^21 molecules of CO2
b. C atom in 3.161x10^21 molecules of CO2

c. O atom in 2.2222x10^24 molecules of CO2
d. K^+ ions in 5.324 *10^16 formula units of KNO2
e. CL^ - ions in 1.000 x 1o^14 formula units of MgCl2
f. N atoms in 2.000 * 10^14 formula units of Ca (NO3)2
g. O atoms in 4.999 x 10^25 formula units of Mg3(PO4)2

chemistry - lyne, Sunday, March 8, 2009 at 7:58pm
this is answered below
chemistry - bre bre, Sunday, March 8, 2009 at 8:05pm
ok can you help with h instead.
chemistry - lyne, Sunday, March 8, 2009 at 8:07pm
h?? where
chemistry - bre bre, Sunday, March 8, 2009 at 8:07pm
i mean g
chemistry - DrBob222, Sunday, March 8, 2009 at 8:51pm
You know from below how to determine moles of the compound, Mg3(PO4)2. Now how many O atoms are in the compound?

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