SIN Starter Quiz M2L2b

The relative mass of water is 18.0 g/mol because:

• the atomic mass of oxygen is 18.0 g/mol.

• water contains three atoms in total.

• the sum of the atomic masses of two hydrogens and one oxygen is 18.0 g/mol.

• the molecular mass of hydrogen is 18.0 g/mol.

How many particles are in one mole of a substance?

• 1.00 x 10²⁰ particles

• 6.02 x 10²³ particles (Avogadro's number)

• 3.14 x 10¹⁵ particles

• 9.81 x 10¹⁸ particles

What mass is 4 moles of water (to 3 sig. fig.)?

• 36.0 g

• 18.0 g

• 90.0 g

• 72.0 g

What mass is 0.2 moles of water (3 sig. fig.)?

• 3.60 g

• 1.80 g

• 0.90 g

• 4.50 g

How many moles of water do you have if you have 6 g of water?

• 0.5 moles

• 0.333 moles

• 0.25 moles

• 1 mole

How many moles of water do you have if you have 20 g of water?

• 1.11 moles

• 1.5 moles

• 0.83 moles

• 2 moles

What is the relative mass of H₂O₂?

• 36 g/mol

• 18.0 g/mol

• 34.0 g/mol

• 32.0 g/mol

How many particles are in 7g of H₂O₂?

• 1.24 x 10²³ particles

• 2.11 x 10²³ particles

• 3.52 x 10²² particles

• 4.18 x x 10²⁴ particles