Mole Calculations

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

Tags

NGSS.HS-PS1-7

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

The mass of one mole of a substance is called...

• molecular mass

• mole constant

• molar mass

• atomic weight

Tags

NGSS.HS-PS1-7

How many molecules are in 6 mole of hydrogen sulfate?

• 6.02x10²³ FU

• 6.02x10¹³⁸ FU

• 5.90x10²⁵ FU

• 3.61x10²⁴ FU

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}

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