The Mole Calculations

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

Calculate the number of particles (atoms) in 0.250 moles of silver.

• 1.62 x 10²⁵ atoms Ag

• 4.15 x 10^-25 atoms Ag

• 1.51 x10²³ atoms Ag

• 27.0 atoms Ag

How many grams are in 7.8 moles of NaCl?

• 476 grams

• 456 grams

• 452 grams

• 462 grams

Tags

NGSS.HS-PS1-7

N₂ + 3H₂ → 2NH₃

How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 1

• 2

• 3

• 6

Tags

NGSS.HS-PS1-7

How many moles of ammonia are needed to form 0.65 moles of nitrogen with excess quantities of nitrogen monoxide?

• 0.65 moles of NH₃

• 4.0 moles of NH₃

• 2.6 moles of NH₃

• 0.52 moles of NH₃

Tags

NGSS.HS-PS1-7

3.0 moles of chlorine are reacted with 3.0 sodium, what was the theoretical yield (how much NaCl should have been produced)?

• 6.0 mol NaCl

• 3.0 mol NaCl

• 9.0 mol NaCl

• 1.5 mol NaCl

Tags

NGSS.HS-PS1-7

If the theoretical yield is 18 moles and the actual yield is 14 moles, what is the percent yield?

• 128.6%

• 32.0%

• 77.8%

• 92.4%

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