Mole Conversions (Moles-Grams-Molecules)

Front

1.2 moles of Neon = ? grams

Back

24 grams

Answer explanation

To find the mass of 1.2 moles of Neon, use the molar mass of Neon, which is approximately 20 grams/mole. Multiply: 1.2 moles x 20 g/mole = 24 grams. Thus, the correct answer is 24 grams.

Front

5.6 moles of sodium bromide = ? grams

Back

576 g

Answer explanation

To find the mass of sodium bromide, multiply the number of moles (5.6) by its molar mass (102.9 g/mol). Thus, 5.6 moles x 102.9 g/mol = 576 g, making 576 g the correct answer.

Front

Convert 28g O₂ to moles.

Back

0.875 moles

Answer explanation

To convert grams to moles, use the formula: moles = mass (g) / molar mass (g/mol). The molar mass of O2 is 32.0 g/mol. Thus, 28.0 g O2 = 28.0 g / 32.0 g/mol = 0.875 moles. Therefore, the correct answer is 0.875 moles.

Front

9.44 moles of AlCl₃ contains:

Back

5.68x10²⁴ molec AlCl₃

Answer explanation

To find the number of molecules in 9.44 moles of AlCl3, multiply by Avogadro's number (6.022 x 10^23). Thus, 9.44 moles x 6.022 x 10^23 molec/mole = 5.68 x 10^24 molec AlCl3, making the correct choice 5.68x10^24 molec AlCl3.

Front

Moles of magnesium in 3.01x10²² atoms?

Back

0.050 moles Mg

Answer explanation

To find moles from atoms, use Avogadro's number (6.02x10^23). Divide 3.01x10^22 by 6.02x10^23: 3.01x10^22 / 6.02x10^23 = 0.050 moles Mg. Thus, the correct answer is 0.050 moles Mg.

Front

Molecules in 9.4 moles of ibuprofen?

Back

5.66x10⁴

Answer explanation

To find the number of molecules in 9.4 moles of ibuprofen, multiply by Avogadro's number (6.022 x 10^23). Thus, 9.4 moles x 6.022 x 10^23 molecules/mole = 5.66 x 10^24 molecules, making 5.66x10²⁴ the correct answer.

Front

Molar mass of Ba(C₂H₃O₂)₂

Back

255.3 g/mol

Answer explanation

To calculate the molar mass of Ba(C2H3O2)2, sum the atomic masses: Ba (137.3 g/mol) + 2*(C (12.0 g/mol)*2 + H (1.0 g/mol)*3 + O (16.0 g/mol)*2) = 255.3 g/mol. Thus, the correct answer is 255.3 g/mol.

Front

Molar mass of PbSO₄

Back

303.27 g/mol

Answer explanation

To find the molar mass of PbSO4, sum the atomic masses: Pb (207.2 g/mol) + S (32.07 g/mol) + 4*O (4*16.00 g/mol) = 207.2 + 32.07 + 64.00 = 303.27 g/mol. Thus, the correct answer is 303.27 g/mol.

Front

Molecules in 31.8 moles of water?

Back

1.91 x 10^25 molecules

Answer explanation

To find the number of molecules in 31.8 moles of water, multiply by Avogadro's number (6.022 x 10^23). Thus, 31.8 moles x 6.022 x 10^23 molecules/mole = 1.91 x 10^25 molecules, which is the correct answer.

Front

Convert 7 moles of Na2SO4 to grams.

Back

994 grams

Answer explanation

To convert moles of Na2SO4 to grams, use the molar mass (142.04 g/mol). Multiply 7.00 moles by 142.04 g/mol to get 994 grams, which is the correct answer.