Mole-Mass Conversions

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express the amount of a substance. It is defined as exactly 6.022 x 10^23 particles (atoms, molecules, ions, etc.) of that substance.

Front

How do you convert moles to grams?

Back

To convert moles to grams, use the formula: grams = moles x molar mass. The molar mass is the mass of one mole of a substance, usually expressed in grams per mole (g/mol).

Front

What is the molar mass of water (H2O)?

Back

The molar mass of water (H2O) is approximately 18.02 g/mol.

Front

How many grams are in 1 mole of sodium chloride (NaCl)?

Back

1 mole of sodium chloride (NaCl) has a mass of approximately 58.44 g.

Front

What is the formula to calculate the number of moles from grams?

Back

The formula to calculate the number of moles from grams is: moles = grams / molar mass.

Front

How many moles are in 72.0 g of water (H2O)?

Back

To find the number of moles in 72.0 g of water, use the formula: moles = grams / molar mass. Molar mass of H2O is 18.02 g/mol, so moles = 72.0 g / 18.02 g/mol = 4.0 moles.

Front

What is the molar mass of magnesium phosphate (Mg3(PO4)2)?

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The molar mass of magnesium phosphate (Mg3(PO4)2) is approximately 262.86 g/mol.

Front

How many grams are in 0.5 moles of carbon (C)?

Back

To find the grams in 0.5 moles of carbon, use the formula: grams = moles x molar mass. Molar mass of C is 12.01 g/mol, so grams = 0.5 moles x 12.01 g/mol = 6.005 g.

Front

How do you find the number of moles in a given mass of a substance?

Back

To find the number of moles in a given mass, divide the mass of the substance by its molar mass.

Front

What is the mass of 0.117 moles of magnesium phosphate (Mg3(PO4)2)?

Back

To find the mass, use the formula: grams = moles x molar mass. Molar mass of Mg3(PO4)2 is 262.86 g/mol, so grams = 0.117 moles x 262.86 g/mol = 30.8 g.