Calculations of Formula Mass and Gram/Mole Conversions

The amount of substance having 6.022 x 10²³ of any kind of chemical unit is called a(n):
1. atomic weight
2. mole
3. formula
4. mass number
The total number of atoms in the formula of aluminum dichromate, Al₂(Cr₂O₇)₃ is:
1. 5
2. 11
3. 17
4. 29
The total number of OXYGEN atoms in the formula of aluminum dichromate, Al₂(Cr₂O₇)₃ is:
1. 7
2. 10
3. 21
4. 29
The formula mass of calcium hydroxide, Ca(OH)₂ is:
1. 57.05 grams
2. 74.10 grams
3. 97.07 grams
4. 128 grams
The formula mass of ammonium chlorate, NH₄ClO₃ is:
1. 101.5 g
2. 172.40 g
3. 78.06 g
4. 211.43 g
What is the molar mass of the gas butane, C₄H₁₀?
1. 58.14 grams
2. 13.02 grams
3. 485.2 grams
4. 68 24 grams
The molar mass of sodium chloride, NaCl is:
1. 2 grams
2. 69.71 grams
3. 58.44 grams
4. 6.022 x 10²³ grams
The formula mass of magnesium hydroxide, Mg(OH)₂ is:
1. 58.33 grams
2. 41.32 grams
3. 42.33 grams
4. 5 grams
What is the mass in grams of 3 moles of water molecules, H₂O?
1. 54.06 grams
2. 6.01 grams
3. 0.166 grams
4. 21.02 grams
What is the mass of 4 moles of hydrogen molecules (H₂)?
1. 4.04 grams
2. 8.08 grams
3. 1.98 grams
4. 3.96 grams
What is the mass in grams of 10 moles of ammonia, NH₃?
1. 1.704 grams
2. 170.4 grams
3. 0.587 grams
4. 27.04 grams
How many moles of water molecules, H₂O, are present in a 42 gram sample of water?
1. 0.429 moles
2. 757 moles
3. 2.33 moles
4. 23.98 moles
How many moles of methane molecules, CH₄, are in 80 grams of methane?
1. 0.201 moles
2. 4.98 moles
3. 1284 moles
4. 6.022 x 10⁸⁰ moles
How many moles of calcium hydroxide, Ca(OH)₂ are in 150 grams of the compound?
1. 2.02 moles
2. 0.494 moles
3. 11115 moles
4. 224.1 moles
About how many atoms of helium would be found in 2 grams of helium?
1. 6.02 x 10²³
2. 3.01 x 10²³
3. 2
4. 4.00260