mole calculations

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

_{Give your answer to 3 sf}

(a)  

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

A lump of MgO consists of 100 moles. What is the mass in grams?

(a)  

What is the volume, in dm³, of 0.16 g of helium gas at r.t.p.?

(Ar of He = 4)

(a)  

CH₄ (g) + 2O₂ (g)→ CO₂ (g)+ 2H₂O (g)

24 grams of CH₄ was added to the above reaction. Calculate the volume of H₂O formed.

• 36 d

  m

  3

  dm^3

  dm3

• 72 d

  m

  3

  dm^3

  dm3

• 27 d

  m

  3

  dm^3

  dm3

• 24 d

  m

  3

  dm^3

  dm3

• 18

• 18 000

• 24 000

• 24

Mg + 2H₂O --> Mg(OH)₂ + H₂

What volume of hydrogen gas will be produced by the reaction 67.3 g of magnesium with excess water?

• 67.3 dm3 

• 0.12 dm3 

• 2.77 dm3 

• 1.15 dm3 

Zn (s)  +  CuCl​₂​​ (aq)  →  ZnCl​₂​  ​(aq) +  Cu (s)

How many grams of ZnCl₂ will be produced from 23.0 g of Zn

• 0.354 g

• 1495 g

• 47.1 g

• 365 g

How many moles of gas are present in 6 dm³ of sulfur dioxide at r.t.p.? Include unit mol in your answer.

(a)  

What is the volume, in dm³, of 64 g of oxygen gas at r.t.p.?

(a)