Mole Calculations

What is the mass of one mole of aluminum chloride?

• 62.5g

• 116.4g

• 133.3g

• 98g

Carbon dioxide gas and water vapour have molar masses of 44 g/mol and 18 g/mol respectively. Which statement(s) about these gases is/are correct?

• At the same temperature and pressure, they occupy the same volume

• At the same temperature and pressure, they occupy different volumes

• Samples of equal volumes of each gas would contain different no.s of moles of each gas

• Samples of equal volumes of each gas would contain the same no.s of moles of each gas

Which option shows the correct working steps to determine the number of moles in a 12 dm³ sample of Cl₂ gas at r.t.p?

• (12/35.5) moles

• (12/71) moles

• (12/24) moles

• (12 x 71) moles

A sample of silver contains 5.71 x 10²² atoms. How many moles of silver are present?

• 3.43 x 10⁴⁶ moles

• 0.0529 moles

• 0.0952 moles

• 10.5 moles

At 100°C, the molar volume of gases is 30 dm³. Calculate the volume of 0.35 moles of steam produced from boiling water.

• 8.4 dm³

• 10.5 dm³

• 3.5 dm³

• 6.3 dm³

The concentration of a potassium nitrate solution is 50 g/dm³. Which option accurately converts this value to obtain the concentration in mol/dm³?

• 50/101

• 50/53

• 50/101 x 1000

• 50/53 x 1000

What is the concentration of the calcium chloride solution in mol/dm³?

• 0.414 mol/dm³

• 0.207 mol/dm³

• 4.14x10^-3 mol/dm³

• 2.07x10^-3 mol/dm³

Tags

NGSS.HS-PS1-5

A bag of fertiliser contains 14.52 kg of ammonium nitrate (NH₄NO₃). Calculate the number of moles of ammonium nitrate in the bag of fertiliser.

_{Give your answer to 1d.p}

Tags

NGSS.HS-PS1-7

Which of the following would have more mass?

• mole of Li

• mole of Au

• mole of Si

• None, all are equal

How many molecules are there in 31.8 moles of water?

• 572 g

• 1.91 x 10²⁵ molecules

• 5.28x 10-²⁵ molecules

• 1.77 g