Chemistry
Stoichiometry
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#25 The total number of atoms represented by the compound CuSO4 . 5H20 is
A) 27
B) 21
C) 5
D) 8
#26 Which of the following compounds contains the highest % by mass of nitrogen?
A) NH3
B) N2H4
C) Urea (NH2)2CO
D) NO2
#27 The relative atomic mass of Chlorine is 35.5. What is the mass of 2 mole of Chlorine gas?
A) 142g
B) 71g
C) 35.5g
D) 18.75g
#28 Ozone O3 is a gas which decomposes into oxygen as shown by the equation
2O3 → 3O2
which of the following statement is incorrect
A) 2 mole of ozone decomposes into 3 mole of oxygen
B) 2 volume of ozone decomposes into 3 volume of oxygen
C) 96g of ozone decomposes into 3 volume of oxygen
D) 48g of ozone produces 32g of oxygen
#29 Which of the following is correct about the NH4
A) 1 moleof hydrogen bond
B) 14g of Nitrogen
C) 4 mole of bond
D) both B and C
#30 23 g of Nitrogen dioxide (NO2) contains:
A) 0.5 mole of N and 1 mole of oxygen
B) NA / 2 atoms of N and NA atoms of oxygen atoms
C) 7 g of N and 16 g of oxygen
D) All of the above
#31 Actual yield must be determined by
A) Calculations
B) Experiements
C) Estimation
D) Theoretical yield
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