Chemistry Quiz

The number of atoms in a mole of any pure substance is called

• its atomic number

• Avogadro's number

• Its mass number

• Its isotopic number

The atomic number of oxygen is 8. The atomic number of sulfur is 16. Compared with a mole of oxygen, a mole of sulfur contains

• twice as many atoms

• half as many atoms

• an equal number of atoms

• 8 times as many atoms

To determine the molar mass of an element, one must know the element's

• Avogadro constant

• atomic number

• number of isotopes

• average atomic mass

Avogadro's number of atoms of any element is equivalent to

• the atomic number of that element

• the mass number of that element

• 6.02 x 10^23 particles

The mass of 1 mol of chromium is about

• 12 g

• 24 g

• 52 g

• 6.02 x 10^23 g

A mass of 6.005 g of carbon contains

• 1 mol of C

• 2 atoms of C

• 0.5000 mol of C

• 1 atom of C

The mass of 2 moles of oxygen atoms is

• 16 g

• 32 g

• 48 g

• 64 g

What is the number of moles of atoms in 9.03 x 10^24 atoms?

• 1.50 mol

• 9.03 mol

• 10.0 mol

A sample of tin contains 3.01 x 10^23 atoms. The mass of the sample is

• 3.01 g

• 59.3 g

• 72.6 g

• 11g

What is the molar mass of magnesium chloride, MgCl₂?

• 46g/mole

• 59.763g/mole

• 95.211g/mole

• 106.354g/mole