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WorksheetsStoichiometric Relationships
Total questions: 10
Worksheet time: 30mins
What is the sum of all coefficients when the following equation is balanced using the smallest possible whole numbers?
__ C2H2 + __O2 → __CO2 + __H2O
5
7
11
13
How many molecules are present in a drop of ethanol, C2H5OH, of mass 2.3 × 10–3 g?
(L = 6.0 × 1023 mol–1)
3.0 × 10 19
3.0 × 1020
6.0 × 1020
6.0 × 1026
Which sample has the greatest mass?
1 mol of SO2
2 mol of N2O
2 mol of Ar
4 mol of NH3
The relative molecular mass of a gas is 56 and its empirical formula is CH2. What is the molecular formula of the gas?
CH2
C2H4
C3H6
C4H8
What is the total number of hydrogen atoms in 1.0 mol of benzamide, C6H5CONH2?
7
6.0 × 1023
3.0 × 1024
4.2 × 1024
Which amount of the following compounds contains the least number of ions?
2 mol of NaOH
1 mol of NH4Cl
2 mol of CaCl2
1 mol of Al2O3
Which is both an empirical and a molecular formula?
C5H12
C5H10
C4H8
C4H10
6.0 mol of aluminium reacts with oxygen to form aluminium oxide. What is the amount of oxygen, in mol, needed for complete reaction?
4Al(s) + 3O2(g) → 2Al2O3(s)
1.5
3.0
4.5
6.0
What is the total number of nitrogen atoms in two mol of NH4NO3?
4
6.02 × 1023
1.20 × 1024
2.41 × 1024
Which sample has the greatest mass?
6.0 × 1025 molecules of hydrogen
5.0 mol of neon atoms
1.2 × 1024 atoms of silver
1.7 × 102 g of iron
