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WorksheetschemVC2ndweek
Total questions: 8
Worksheet time: 8mins
Which of the following contains 6.02 x 10x23 molecules?
1 mole of NaCl
1 mole of nitrogen gas
1 mole of helium
1 mole of silver
A calcium atom is 3.33 times the mass of a carbon atom. What is the atomic mass of calcium?
33
40
38
12
The number of oxygen atoms in 2.50 mol K2Cr2O7 is
6.02 x 1023
1.20 x 1024
1.55 x 1025
1.02 x 1025
A sample of gas contains 14g of N2. This is equal to
1 mol of N2
1 molar volume of N2
2 mol of N2
0.5 mol of N2
All of the following are empirical formulae except
CH2O
N2O
N2O4
CH2
A sample of helium gas occupies 955.5 cm3 at 1 atm and 273 K. how many moles of helium are present in the sample?
0.03 mol
0.04 mol
0.20 mol
0.40 mol
A solution contains 28% sulphuric acid by mass. This means that
1 dm3 of solution contains 28 g of sulphuric acid
1 dm3 of solution has a mass of 28 g of sulphuric acid
100 g of solution contains 28 g of sulphuric acid
100 g of solution contains 28% of sulphuric acid
A 45% by mass of glucose (C6H1206) solution contains 70 g of water. what is the mass of glucose in the solution?
57.3 g
53.3 g
35.7 g
17.5 g
