WorksheetsChemistry Stoichiometry (Pre U Plus)
Total questions: 6
Worksheet time: 18mins
Which statement is correct?
A Cl has relative isotopic mass of 35.5
B MgCl2 has relative molecular mass of 95.3
C Cl2 has relative molecular mass of 70
D SO3 has relative molecular mass of 80.1
A
B
C
D
How many oxygen atom does 0.75 mol of sulfur dioxide have?
4.15 x 10^23
4.52 x 10^23
9.03 x 10^23
1.35 x 10^24
A sports medal has a total surface area of 100 cm2. It was evenly coated with silver electrolysis. Its mass increased by 0.316 g.
How many atoms of silver were deposited per cm2 on the surface of the medal? medal?
1.54 x 10^23
1.76 x 10^19
3.00 x 10^21
3.00 x 10^23
A washing powder contains sodium hydrogencarbonate, NaHCO3, as one of the ingredients.
In a titration, a solution containing 1.00 g of this washing powder requires 10 cm3 of 0.200 moldm−3 sulfuric acid for complete reaction. The sodium hydrogencarbonate is the only ingredient that reacts with the acid.
What is the percentage by mass of sodium hydrogencarbonate in the washing powder?
33.6%
12.0%
16.8%
6.8%
11.32
8.18
0.06
0.12
The airbags in Cars contain sodium azide, NaN3, and an excess of potassium nitrate, KNO3.In a car accident, the reactions shown occur, producing nitrogen. This causes the airbag to inflate rapidly.
2NaN3 → 2Na + 3N2
10Na + 2KNO3 → K2O + 5Na2O + N2
How many moles of nitrogen gas are produced in total when 1 mol of sodium azide, NaN3, decomposes in an airbag?
3.2
4.0
1.5
1.6
