Mole/Molar Mass/Conversions

Front

What is the mole used for?

Back

To measure the amount of atoms or molecules in a substance.

Front

Calculate the volume in liters of 7.50 mol of helium gas at STP.

Back

168 L He.

Front

What is the molar mass of NaCl?

Back

58 grams.

Front

How many moles are in 20 grams of Ca (Calcium)?

Back

0.5 moles.

Front

What is the mass of 0.89 mol of CaCl2?

Back

98.9 grams.

Front

Define molar mass.

Back

The mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

What is the value of Avogadro's number?

Back

6.02 x 10^23, which represents the number of atoms or molecules in one mole.

Front

How do you convert grams to moles?

Back

Divide the mass of the substance (in grams) by its molar mass (in g/mol).

Front

What is STP in chemistry?

Back

Standard Temperature and Pressure, defined as 0 degrees Celsius and 1 atmosphere pressure.

Front

How many liters are in one mole of an ideal gas at STP?

Back

22.4 liters.