Chemical Quantities EXT

What SI unit is used to measure the number of representative particles in a substance?

• kilogram

• ampere

• kelvin

• mole

If a dozen Clementine oranges have a mass of 744 g, what will be the mass of 15 Clementines?

• 11.16 kg

• 595 g

• 896 g

• 930 g

How many moles of tungsten atoms are in 4.8 X 10²⁵ atoms of tungsten?

• 8.0 X 10² moles

• 8.0 X 10¹ moles

• 1.3 X 10^-1 moles

• 1.3 X 10^-2 moles

How many moles of silver atoms are in 1.8 X 10²⁰ atoms of silver?

• 3.0 X 10^-4

• 3.3 X 10^-3

• 3.0 X 10²

• 1.1 X 10⁴⁴

How many atoms are in 0.075 mol of titanium?

• 1.2 X 10^-25

• 2.2 X 10²⁴

• 6.4 x 10²

• 4.5 x 10²²

How many molecules are in 2.10 mol CO?

• 2.53 x 10²⁴ molecules

• 3.79 x 10²⁴ molecules

• 3.49 X 10^-24 molecules

• 1.26 X 10²⁴ molecules

How many atoms are in 3.5 moles of arsenic atoms?

• 5.8 X 10^-24 atoms

• 7.5 X 10¹ atoms

• 2.1 X 10²⁴ atoms

• 1.7 X 10²³ atoms

Use the following information to answer the next question:

An average bushel of apples has a mass of 10 kg and contains 5 dozen apples.

What would be the average mass of 6 apples?

• 1.0 kg

• 4.0 kg

• 0.50 kg

• 2.0 kg

What is true about the molar mass of chlorine gas?

• The molar mass is 35.5g.

• The molar mass is 71.0g.

• The molar mass is equal to the mass of one mole of atoms.

• none of the above

The mass of a mole of NaCl is the

• molar mass.

• atomic mass.

• molecular mass.

• compound mass.