Math and Moles Test Review

Front

What is the conversion factor from milliliters to liters?

Back

1 L = 1000 mL, so to convert mL to L, divide by 1000.

Front

How do you convert 400 mL to liters?

Back

400 mL = 400 / 1000 = 0.4 L.

Front

What is the importance of units in conversions?

Back

Units are essential in conversions to ensure that the quantities being compared or calculated are compatible and correctly represented.

Front

How do you convert molecules to moles?

Back

Use Avogadro's number: 1 mole = 6.022 x 10^23 molecules.

Front

Convert 8.0 x 10^20 molecules of H2 to moles.

Back

8.0 x 10^20 molecules H2 = (8.0 x 10^20) / (6.022 x 10^23) = 1.3 x 10^-3 mol.

Front

What is the conversion from gigagrams to grams?

Back

1 Gg = 10^9 g.

Front

Convert 19 Gg to grams in scientific notation.

Back

19 Gg = 19 x 10^9 g = 1.9 x 10^10 g.

Front

What is the molar mass of CH4 (methane)?

Back

The molar mass of CH4 is approximately 16.04 g/mol.

Front

How do you calculate the mass from moles?

Back

Mass (g) = Moles x Molar Mass (g/mol).

Front

What is the mass of 5.67 moles of CH4?

Back

Mass = 5.67 moles x 16.04 g/mol = 91.0 g.