Finding Mr (basic)
What is the Relative Formula Mass (Mr) of Carbon Dioxide (CO2)?
44
Calculate the Mr of Calcium Carbonate (CaCO3)!
100
12g of Carbon reacts completely with Oxygen to form CO2.
(C + O2 --> CO2)
What mass of CO2 is produced?
44g
In the reaction 2Na + Cl2 --> 2NaCl, how much NaCl is produced from 23g of Sodium?
58.5g
Calculate the Mr of Methane (CH4)
16
Calculate the Mr of Calcium Hydroxide [Ca(OH)2].
74
24g of Magnesium reacts with Oxygen to form MgO.
(2Mg + O2 --> 2MgO)
What mass of MgO is formed?
40g
What mass of Hydrogen gas is produced when 12g of Magnesium reacts with excess Hydrochloric Acid?
Mg + 2HCl --> MgCl2 + H2
1g
Calculate the Mr of Sodium Hydroxide (NaOH)
40
Calculate the Mr of Hydrated Copper Sulfate (CuSO4.5H2O).
250
How many grams of Water (H2O) are produced when 4g of Hydrogen gas burns completely in Oxygen?
(2H2 + O2 --> 2H2O)
36g
Calculate the mass of Oxygen needed to react completely with 27g of Aluminum to form Al2O3.
4Al + 3O2 --> 2Al2O3
24g
What is the Mr of two molecules of Magnesium Oxide (2MgO)?
80
Calculate the Mr of Aluminum Sulfate [Al2(SO4)3].
342
What mass of Carbon Dioxide is made when 50g of Calcium Carbonate thermally decomposes?
(CaCO3 --> CaO + CO2)
22g
What mass of Calcium Oxide (CaO) is formed when 20g of Calcium burns in Oxygen?
2Ca + O2 --> 2CaO
28g
Calculate the Mr of Water (H2O) and Ammonia (NH3). Which one is heavier?
Water (Mr H2O = 18, Mr NH3 = 17)
Calculate the Mr of Ammonium Phosphate [(NH4)3PO4].
149
Calculate the mass of Iron produced when 160g of Iron(III) Oxide reacts with excess Carbon Monoxide.
(Fe2O3 + 3CO --> 2Fe + 3CO2)
112g
100g of CaCO3 reacts with HCl.
CaCO3 + 2HCl --> CaCl2 + H2O + CO2
What is the total mass of products formed?
173g (or mass of reactants = 100g + 73g)