Chemistry
Mix
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#33 How many moles are there in 60g of NaOH?
A) 4 mol
B) 1.5 mol
C) 2 mol
D) 3 mol
Answer: B
#34 Which of the following have greater number of atoms?
A) 6 moles of S
B) 2.0 moles of S8
C) 5.0 moles of SO2
D) 44.8 dm3 of CO at STP
Answer: B
#35 18.02g of H2O has:
A) 1 mole of hydrogen atoms
B) 1/2 mole of oxygen atoms
C) 6.022 x 10^23 moles of H2O
D) 6.022 x 10^23 molecules of H2O
Answer: D
#36 If 15g of sulphur are burnt, what volume of SO2 is produced at STP?
A) 10.5 dm3
B) 20 dm3
C) 30 dm3
D) 100 dm3
Answer: A
#37 The largest number of molecules are present in:
A) 44g CO2
B) 98g H2SO4
C) 36g H2O
D) 180g C6H12O6
Answer: C
#38 The relative atomic mass of oxygen is 16 amu. What is the mass of 2 mol of oxygen gas?
A) 64g
B) 32g
C) 100g
D) 71g
Answer: A
#39 The number of atoms present in 32 amu of oxygen gas:
A) 2
B) 6.023 x 10^23
C) 4
D) 8
Answer: A
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