Molar Quantities

Front

True or False:

A mole is a large number used to simplify the counting of atoms.

Back

True

Front

The molar mass of Na₂CO₃

Back

105.98 g

(2 x Na) + C + (3 x O) =

(2 x 22.99g) + 12.01g + (3 x 16.0g)

Front

True or False:

The number of representative particles in a mole (6.02 × 10²³) is called Avogadro’s number.

Back

True

Front

True or False:

Particles counted by moles can only be atoms.

Back

False

It's just a number - you can use it to count ANYTHING. But, because the number is so large, it is only useful to count really small things like atoms, molecules, and other small particles.

Front

What is the mass of 6 red apples in kilograms if a dozen weighs 0.50 kg?

Back

0.25 kg

6 apples is 1/2 as much as a dozen.

6 apples x (0.50 kg/12 apples) =

Front

What is the mass of 9 red apples in kilograms if a dozen weighs 0.50 kg?

Back

0.38 kg

9 apples is 3/4 as much as a dozen.

9 apples x (0.50 kg/12 apples) =

Front

How many moles of copper are there in the copper sample shown?

Back

1.5 moles

95.33 g x (1 mole Cu / 63.55 g) =

Front

The mass of 2 moles of Cu

Back

127.10 g

2 mole x (63.55 g / 1 mole) =

Front

How many moles of copper are there in a sample of copper that weighs 200.0 g?

Back

3.15 moles

200.0 g Cu x (1 mole Cu / 63.5 g Cu) =

Front

How many moles of copper are there in a copper sample of mass 31.7 g?

Back

0.50 moles

31.7 g x (1 mole / 63.45 g) =