Instructions for Conversion Problems
For every conversion problem
Write the number in the problem down with unit and a multiplication sign
Decide which conversion factor you should use, Avagadro’s or molar mass.
Use your index card to determine which way you should use your conversion factor.
Then write the conversion factor down next to the multiplication sign.
Make sure your units cancel and you have the unit you’re solving for on top.
Remember all numbers must have units.
Cancel your units then solve the problem. You should enter the numbers in your
calculator just as you see them on your paper. The number you are given in the problem
always goes first.
If you have an exponent don’t forget to use the 2nd , button. This takes the place of the
x10. So on your calculator it should read, 6.02E23.
Then put your answer down in proper sig. figs and unit. Don’t forget to look to see if
there is an E at the end.
Calculating Molar Mass of a Compound
Remember to determine the molar mass of an element you look at the periodic table. We
will only use 3 sig figs…. If more than 3, round to proper number.
If you have a compound, need to
1.
write down each element in the compound in a column.
2.
Next to the element write the number of each element. If you have a parentheses
you must multiply the numbers inside by the one outside.
3.
Next to the number of each element, write a multiplication sign (x).
4.
Look up mass of each element on the periodic table and write it next to the times
sign.
5.
Place an = sign next to the mass of each element.
6.
Multiply the number of each element by its mass and write the number next to the
= sign.
7.
Go to the last column and add the masses. This is your molar mass of a
compound.
Sometimes, you will need to use both factors to convert. Remember the Chemistry twostep. You just have to go from grams to mole then to particles or vise versa.
Mole to Mass Problems for an element Answers in Red
A1.
Determine the number of grams in 3.75 mol of iron. 209
A2.
Determine the number of grams in 2.50 mol of lead. 518
A3.
Determine the number of grams in 1.25 mol of zinc. 81.8
A4.
Determine the number of grams in 1.75 mol of sodium. 40.3
A5.
Determine the number of grams in 5.25 mol lithium. 36.4
A6.
Determine the number of grams in 4.25 mol rubidium. 363
A7.
Determine the number of grams in 1.50 mol barium. 206
A8.
Determine the number of grams in 2.25 mol mercury. 452
A9.
Determine the number of grams in 2.75 mol copper. 175
A10.
Determine the number of grams in 3.25 mol chromium. 169
A11.
Determine the number of grams in 3.50 mol manganese. 192
A12.
Determine the number of grams in 4.50 mol Magnesium. 109
A13.
Determine the number of grams in 4.75 mol gold. 936
A14.
Determine the number of grams in 5.50 mol silver.594
A15.
Determine the number of grams in 5.75 mol potassium. 225
A16.
Determine the number of grams in 6.25 mol nickel. 367
Mole to Representative Particle
B1.
Calculate the number of formula units in 12.5 mol Calcium carbonate.7.53E24
B2.
Calculate the number of molecules in 5.12 mol water. 3.08E24
B3.
Calculate the number of atoms in 2.15 mol zinc. 1.29E24
B4.
Calculate the number of formula units in 2.5 mol sodium carbonate. 1.5E24
B5.
Calculate the number of molecules in 2.10 mol CCl4. 1.26E24
B6.
Calculate the number of atoms in 1.25 mol iron. 7.53E23
B7.
Calculate the number of formula units in 2.2 mol lithium chloride. 1.3E24
B8.
Calculate the number of molecules in 11.5 mol CO. 6.92E24
B9.
Calculate the number of atoms in 22.5 mol Rubidium. 1.35E25
B10.
Calculate the number of formula units in 4.35 mol rubidium bromide. 2.62E24
B11.
Calculate the number of molecules in 3.35 mol CO2. 2.02E24
B12.
Calculate the number of atoms in 2.64 mol calcium.1.59E24
B13.
Calculate the number of formula units in 1.23 mol potassium nitrate.7.40E23
B14.
Calculate the number of molecules in 6.65 mol P2O5.4.00E24
B15.
Calculate the number of atoms in 15.25 mol lead.9.181E24
B16.
Calculate the number of formula units in 3.8 mol magnesium sulfite.2.3E24
Representative Particle to Mole
C1.
How many moles of calcium chloride contains 1.26 x 1024 formula units?2.09
C2.
How many moles of CO2 contains 2.16 x 1025 molecules?35.9
C3.
How many moles of zinc contains 6.26 x 1019 atoms?1.04E-4
C4.
How many moles of sodium chloride contains 1.62 x 1024 formula units?2.69
C5.
How many moles of CO contains 2.26 x 1014 molecules?3.75E-10
C6.
How many moles of silver contains 5.26 x 1029 atoms?8.74E5
C7.
How many moles of sodium nitrate contains 1.26 x 1024 formula units?2.09
C8.
How many moles of CCl4 contains 1.26 x 1024 molecules?2.09
C9.
How many moles of lead contains 3.26 x 1023 atoms? .542
C10.
How many moles of potassium sulfate contains 1.26 x 1024 formula units?2.09
C11.
How many moles of P2O5 contains 1.26 x 1024 molecules?2.09
C12.
How many moles of iron contains 2.2 x 1020 atoms?3.7E-4
C13.
How many moles of magnesium bromide contains 6.2 x 1026 formula units?1.0E3
C14.
How many moles of CO2 contains 2.6 x 1027 molecules?4.3E3
C15.
How many moles of mercury contains 5.66 x 1024 atoms?9.40
C16.
How many moles of rubidium iodide contains 7.61 x 1024 formula units?12.6
Grams to Mole Element
D1.
Determine the number of moles of arsenic in 1.90g. .0254
D2.
Determine the number of moles of magnesium in 9.1g. .37
D3.
Determine the number of moles of calcium in 1.234g. .03077
D4.
Determine the number of moles of potassium in 2.134g. .05458
D5.
Determine the number of moles of antimony in 1.650 g. .01352
D6.
Determine the number of moles of sodium in .0189g.8.22E-4
D7.
Determine the number of moles of strontium in 1.1200g. 0.012785
D8.
Determine the number of moles of rubidium in 6.05g. .0708
D9.
Determine the number of moles of titanium in 220 g.4.6
D10.
Determine the number of moles of lead in 135 g. .652
D11.
Determine the number of moles of platinum in 3.56 g. .0183
D12.
Determine the number of moles of gold in 355 g.1.80
D13.
Determine the number of moles of scandium in 1.420g. .03156
D14.
Determine the number of moles of mercury in 3650 g.18.2
D15.
Determine the number of moles of lithium in 0.0052 g.7.5E-4
D16.
Determine the number of moles of aluminum in 0.0055 g.2.0E-4
Mole to Mass for a Compound
E1.
Calculate the mass of 42.5 mol of potassium cyanide.2770
E2.
Calculate the mass of 24.5 mol of potassium hypochlorite.2220
E3.
Calculate the mass of 40.50 mol of sodium nitrite.2795
E4.
Calculate the mass of 2.50 mol of sodium dichromate.655
E5.
Calculate the mass of 11.25 mol of acetic acid.675.0
E6.
Calculate the mass of 3.45 mol of P4O10.980.
E7.
Calculate the mass of 4.53 mol of CH4.72.5
E8.
Calculate the mass of 6.24 mol ammonium nitrate.499
E9.
Calculate the mass of 55 mol of calcium carbonate.5500
E10.
Calculate the mass of .125 mol of magnesium phosphate. 32.9
E11.
Calculate the mass of .1700 mol of aluminum oxalate.54.06
E12.
Calculate the mass of 220 mol of lithium chloride 9300
E13.
Calculate the mass of 21.5 mol of magnesium oxide.8660
E14.
Calculate the mass of .1060 mol of sulfuric acid.10.40
E15.
Calculate the mass of 105 mol of CCl4.16200
E16.
Calculate the mass of 232 mol of C6H12O6.41800
Mass to Mole for a Compound
F1.
Determine the number of moles present in 456g cupric nitrate.2.43
F2.
Determine the number of moles present in 654g cupric sulfate.4.09
F3.
Determine the number of moles present in 123g cupric phosphate. .323
F4.
Determine the number of moles present in 652g C6H6.8.35
F5.
Determine the number of moles present in 315g plumbic chloride. .903
F6.
Determine the number of moles present in 25g of CH 4.1.6
F7.
Determine the number of moles present in 1.24g CO2. .0282
F8.
Determine the number of moles present in 650g potassium hydroxide.12
F9.
Determine the number of moles present in 312.0g aluminum nitrate.1.465
F10.
Determine the number of moles present in 45.3g magnesium chlorite. .285
F11.
Determine the number of moles present in .057g lithium iodide.4.3E-4
F12.
Determine the number of moles present in 227g strontium fluoride.1.80
F13.
Determine the number of moles present in 12.60g barium acetate. .04941
F14.
Determine the number of moles present in 271.5g ferrous sulfite.1.996
F15.
Determine the number of moles present in 6020g manganous bromide.28.0
F16.
Determine the number of moles present in 340g C6H14. 3.9
Particles to Grams
G1.
What mass of sodium hydroxide contains 4.58 x 1023 formula units?30.4
G2.
What mass of CO contains 6.26 x 1024 molecules?291
G3.
What mass of lead contains 3.26 x 1022 atoms?11.2
G4.
What mass of lithium chloride contains 1.26 x 1015 formula units? 8.87E-8
G5.
What mass of C5H10 contains 9.16 x 1024 molecules?1070
G6.
What mass of mercury contains 1.26 x 1044 atoms?4.21E22
G7.
What mass of calcium hydroxide contains 8.26 x 1022 formula units?10.2
G8.
What mass of C4H10 contains 1.16 x 1027 molecules?112000
G9.
What mass of lithium contains 1.26 x 1044 atoms?1.45E21
G10.
What mass of magnesium nitrate contains 3.06 x 1014 formula units?7.52E-8
G11.
What mass of C2H6 contains 6.24 x 1020 molecules? .0312
G12.
What mass of platinum contains 2.57 x 1054 atoms?8.32E32
G13.
What mass of calcium perchlorate contains 5.36 x 1029 formula units?2.13E8
G14.
What mass of NO2 contains 4.96 x 1018 molecules?3.79E-4
G15.
What mass of gold contains 8.42 x 1023 atoms?276
G16.
What mass of barium hydroxide contains 3.01 x 1021 formula units? .855
Grams to Particles
H1.
Calculate the number of atoms in 65.0g lead.1.89E23
H2.
Calculate the number of molecules in 45.0g NO.9.03E23
H3.
Calculate the number of formula units in 351g lithium sulfide.4.59E24
H4.
Calculate the number of atoms in 1050 g tungsten.3.44E24
H5.
Calculate the number of molecules in 340g SO2.3.2E24
H6.
Calculate the number of formula units in 1.66g aluminum phosphate.8.19E21
H7.
Calculate the number of atoms in 1123g of gold.3.432E24
H8.
Calculate the number of molecules in 213g I2.5.05E23
H9.
Calculate the number of formula units in 452g magnesium carbonate. 3.23E24.
H10.
Calculate the number of atoms in 21.20g aluminum.4.727E23
H11.
Calculate the number of molecules in 14.7g N2O5. 8.20E22
H12.
Calculate the number of formula units in .05200g of BaSO4.1.344E20
H13.
Calculate the number of atoms in 52.12g titanium.6.553E23
H14.
Calculate the number of molecules in 333g C3H6.4.762E24
H15.
Calculate the number of formula units in 342g strontium nitrate.9.71E23
H16.
Calculate the number of atoms in 1520g cadmium.8.17E24