Chemistry
Stoichiometry
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#41 Consider the following reaction
Al2(SO4)3 + 6NH4OH → 2Al(OH) + 3(NH4)2SO4
Which of the following is limiting reagent if 0.2 mole of Al2(SO4)3 is allowed to react with 1.2 mole of the NH4OH?
A) NH4OH
B) Al2(SO4)3
C) The amount is stoichiometric
D) The amount is nonstoichiometric
#42 How many OH will be produced if 0.003 mole of Mg (OH)2 completely ionized in water?
Mg(OH)2 → 2OH- + Mg2+
A) NA of OH
B) 0.001 NA of OH
C) 0.003 NA of OH
D) 0.006 NA of OH
#43 The mass of oxygen in 1kg of NH4NO3 is ?
A) 300g
B) 400g
C) 500g
D) 600g
#44 Which is not correct about 1 mole of ethyne?
A) It contains 2 mole of Hydrogen
B) It contains 2 mole of pi bonds
C) It contains 1 mole of sigma bonds
D) It contains 2 NA of carbon atoms
#45 Which pair has equal volume at STP?
A) 12.8 g of SO2 and 0.5 mole of NO2
B) NA number of SO2 and 0.6 mole of CO2
C) 1 mole of CO2 gas and 30 g of ethane gas
D) 1 mole of He and NA / 2 of Cl2
#46 Which of the following will not have the mass of 10g
A) 0.1 mole f CaCO3
B) 1.51 x 1023 Ca2+
C) 0.016 mole CO3-2
D) 2.5 NA of He
#47 What mass pf carbon contains 2x1021 atoms of carbons?
A) 0.0396 g
B) 0.05 g
C) 0.012 g
D) 0.12 g
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