Year 10 Moles Quiz

In Chemistry, the unit for the amount of a substance is the ...

• gram

• kilogram

• mole

• cubic decimeter (dm3)

The relative formula mass, M_r, of MgCl₂ is: 

• 95

• 46

• 59.5

• 95g

The molar mass of NaHCO₃ is:

• 84

• 84g

• 52

• 52g

Which of these is the correct formula for number of moles of a compound?

• number of moles = mass (in g) x relative formula mass (M_r)

• number of moles = mass (in g) ÷ relative formula mass (M_r)

• number of moles = mass (in kg) x relative formula mass (M_r)

• number of moles = mass (in kg) ÷ relative formula mass (M_r)

How many moles are there in 10g of NaOH ?  

• 4

• 400

• 0.25

• 0.00025

What is the mass of 0.2 moles of CO₂?

• 8.8g

• 220g

• 0.00454g

• 8.8kg

A farmer bought 40kg of the fertilizer ammonium nitrate, NH₄NO_3. The relative formula mass of ammonium nitrate is:

• 42

• 80

• 45

• 23

If the farmer purchased 40 kg of the previously mentioned fertiliser (Mr=80). How many moles of fertiliser did she buy?

• 0.5 moles

• 2.0 moles

• 500 moles

• 3200 moles

Carbon dioxide, CO₂, is a greenhouse gas.

How many moles in 1.00 tonne of carbon dioxide? [1 tonne = 1,000,000g]

• 0.0227

• 22.7

• 22 727

• 44

Which of the following contains the greatest number of atoms?

• 2 moles of carbon, C

• 36g of carbon, C

• 0.5 moles of magnesium, Mg

• 48g of magnesium, Mg