Friday
March 24, 2017

Post a New Question

Posted by on Tuesday, March 10, 2009 at 6:45pm.

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 need help - , Tuesday, March 10, 2009 at 7:26pm

    There are 6.02 x 10^23 molecules in a mole of molecules or atoms in a mole of atoms. Here is how you do the first one.
    3.161 x 10^21 molecules CO2 x (1 mole CO2 molecules/6.02 x 10^23 molecules CO2) x (2 atoms O/1 molecule CO2) = ?? moles O atoms in 3.161 x 10^23 molecules CO2.
    The others are done the same way. Note the use of the factors. They all work this way, even with different problems (of course the factors are different for different kinds of problems).

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question