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WorksheetsMole concept 2
Total questions: 13
Worksheet time: 20mins
You need to make 200 mL of a 0.20 M aqueous solution of sodium chloride. The only available solution is 1.0 M. Determine how to make the needed dilution.
Add 160 mL of water to the initial solution
Add 160 grams of water to the initial solution
Evaporate 160 mL from the initial volume
The experiment cannot be conducted with the materials provided
Which of the following statement is INCORRECT
protium has no neutron
C14 is used for finding age of old wooden objects
Ca-40 and Ar-50 are isotopes
Ca-40 and Ar -40 are isobars
The number of atoms present in one mole of an element is equal to Avogadro
number. Which of the following element contains the greatest number of
atoms?
4g He
46g Na
0.4g Ca
12g He
What vol of air is needed for complete combustion of 32g methane
2*22.4l
4*22.4l
20*22.4l
22.4l
If 20 litre nitrogen gas reacts with 30 litre hydrogen gas to give ammonia, the volume of product formed is
40
20
50
30
2.46 g of sodium hydroxide (molar mass = 40) is dissolved in water and the solution is made to 100 cm3 in a volumetric flask. The molarity of the solution is:
3.14 M
0.04 M
0.615 M
4.2 M
A compound contains 4.07% hydrogen, 24.27% carbon and 71.65% chlorine. Its molecular mass is 98.96. Its empirical formula IS:
C2H2Cl2
CHCl
CHCl2
CH2Cl
The Molarity of a solution of ethanol in water having a mole fraction of ethanol is 0.040 would be
2.143
2.314
2.413
2 141
1
2
3
4
20 volume of H2O2 has a strength of
17
3
6
9
What volume of 0.250 M HCl (aq) is required to react completely with 22.6 g of sodium carbonate according to the reaction:
Na2CO3 (s) + 2HCl (aq) → 2NaCl (aq) + H2O + CO2
1000 ml
1704 ml
2600 ml
1802 ml
A
B
C
D
A
B
C
D
