Particles
Moles
Grams
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100

How many Mg2+ ions are in 1.00 mol of MgO?

6.02 x1023

100
What is the mass (g) of 1.00 mol Li?
6.94 g Li
100

How many grams of NaCl are present in 11.00 moles?

642.9 g

100
What is Avogadro's Number?
6.02 x 10^23
100
How is the mass in grams of the element converted to amount in moles?
Divide by the molar mass
200

How many Mg2+ ions are found in 3.00 moles of MgCl2

1.81 x1024

200

How many grams of silicon would there be in a sample that contained 9.99 x 1052 atoms?



4.66 x 1030


200

Given three (3.00) moles of gold (Au), how many grams do you have?

591 g


200

The sum of the atomic masses of all the atoms in a formula for a covalent compound is the

molecular mass

200
How is the mass in grams of the element converted to number of atoms?
Divided by molar mass, then multiply by Avogadro's Number
300

How many molecules in 0.20 mol of H2O

1.2 x1023 molecules

300

How many moles are there in a sample containing 2.408 x 1024 atoms of carbon?



4.000

300
How many moles are in 0.535 g Zn?
0.00818 mol Zn
300


What is the formula mass of MgSO4?



120.37 amu

300

What is the mass of a mole of an element?

The amu of the element found on the periodic table

400
How many atoms in 0.250 mol S?
1.51 x 10^23 atoms S
400
How many mores in 2.25 x 10^25 atoms Zn?
37.4 mol Zn
400
How many grams in 4.50 x 10^12 atoms Cl?
2.65 x 10^-10 g Cl
400

What is the percent of hydrogen in methane, CH4?



25.1

400

What is the formula mass of sodium chloride, NaCl?



58.44 amu


500
How many atoms in 0.02550 g Pt?
7.872 x 10^19 atoms Pt
500
How many moles in 150 g S?
4.7 mol S
500
How many grams in 8.42 x 10 atoms Br?
0.00112 g Br
500

C = 40.9%
H = 4.58%
O = 54.5%

What is the empirical formula for the molecule?



C3H4O3


500

An unknown compound has the empirical formula CH. If the molar mass of the compound is determined to be 26.0 g/mol, what is its molecular formula?

C2H2