A1 - Mass and Moles Calculations Flashcards
What is the equation used to calculate moles using mass and Mr?
Moles = Mass ÷ Mr
What is the equation used to calculate mass using moles and Mr?
Mass = moles x Mr
What is the equation used to calculate Mr using moles and mass?
Mr = Mass ÷ Moles
How is mass in kg converted to mass in g?
kg →g x1000
How is mass in mg converted to mass in g?
mg →g ÷1000
What is the definition of a mole
1 mole of any substance contains the same number of particles as there are atoms in 12.00g of carbon-12
How many particles are in one mole?
the number of particles in 1 mole is 6.02 x 1023
What is the Mr of N2
28
What is the Mr of FeSO4
151.9
What is the Mr of Al(OH)3
78
What is the Mr of PbO
223.2
What is the Mr of Ca(OH)2
74.1
Calculate the number of moles present in 2.3g of N2
Calculate the number of moles present in 12.5g of FeSO4
Calculate the number of moles present in 2.00 kg of MgSO4
Calculate the number of moles present in d) 125 mg of Al(OH)3
Calculate the number of moles present in 5.20 kg of PbO
Calculate the mass (in grams) of 0.0500 moles of Cl2
Calculate the mass (in grams) of 2.00 moles of Ca(OH)2
Calculate the mass (in grams) of 2.55 moles NH3
Calculate the mass (in grams) of 0.125 moles of KBr
Calculate the mass (in grams) of 250 moles of Fe2O3
Calculate the Ar of the following elements and deduce their identity.
2.00 moles weighing 24.0 g
Calculate the Ar of the following elements and deduce their identity.
1.32 moles weigh 30.4 g
Calculate the Ar of the following elements and deduce their identity.
0.0100 moles weigh 320 mg
Calculate the Ar of the following elements and deduce their identity.
0.0150 moles, 0.420 g
Calculate the Ar of the following elements and deduce their identity.
0.0125 moles, 0.500 g
