Chemistry
Stoichiometry
Page 3 of 7
#17 The volume of SO2 (STP) is given off on heating 9.7g of ZnS ?
2ZnS + 3O2 → ZnO + 2SO2
A) 22.4 dm3
B) 2.24 dm3
C) 0.0224 dm3
D) 44.8 dm3
#18 How many moles of oxygen are needed for the complete cumbustion of 2 mole of methene (CH4) ?
A) 2.5 mole
B) 3.5 mole
C) 4 mole
D) 4.5 mole
#19 How many moles of oxygen are produced when 3 mol of KCIO3 decompose completely?
2KCIO3 → 3KCI + 3O2
A) 1 mol
B) 2 mol
C) 2.5 mol
D) 4.5 mol
#20 One mole of butane has the same
A) number of carbon atoms as one of C2H6
B) number og molecules as one mole of CH4
C) Mass as half a mole of hexane
D) number of hydrogen atoms as one mole of C3H8
#21 Two different hydrocarbons each contains the same percentage by mass of hydrogen it means that they have the same
A) number of atoms
B) empirical formula
C) number of isomer
D) relative molecular mass
#22 The limiting reagent in a chemical reaction is one that:
A) Has the largest molar mass (formula weight).
B) Has the smallest molar mass (formula weight).
C) Has the smallest coefficient.
D) is consumed completely
#23 The equation for burning of hydrogen is
2H2 + O2 → 2H2O
One mole of hydrogen gas is mixed with 1 mole of oxygen gas and brunt
A) 1 mole of steam
B) 1 mole of steam and 0.5 mole of oxygen gas
C) 2 mole of steam only
D) 2 mole of steam and 0.5 mole of hydrogen
Page 3 of 7
Register or Login for comments
Comments: