WorksheetsCHEMISTRY A+ 1.0
Total questions: 16
Worksheet time: 14mins
Why carbon-12 was chosen as a reference standard for RAM & RMM?
Carbon has three isotopes
Carbon is a non-metal element
Carbon is a solid & easier to handle
Carbon can react with other element
8 atoms of element X has the same mass as 2 atoms of Tellurium, Te. What is the RAM of X?
[RAM Te = 128]
16
8
64
32
The chemical formula of potassium hexacyanoferrate(III) is K3Fe(CN)6
What is its RFM?
[RAM Fe = 56, K = 39, C = 12, N = 14
121
329
251
199
The RMM of M2(SO4)3 is 342. What is the RAM of element M?
[RAM O = 16, S = 32)
35
118
56
27
The chemical formula of butane is C4H10
How many hydrogen atoms in 1 mol of butane gas?
[Av = 6.02 x 1023]
2 x 6.02x1023
8 x 6.02x1023
10 x 6.02x1023
4 x 6.02x1023
Which of the following particles equal to 1 mole?
6.02 x 1023 hydrogen atoms in hydrogen gas
6.02 x 1023 hydrogen molecule in hydrogen gas
The number of atom in 1g of hydrogen gas
The number of molecule in 1g hydrogen gas
What is the number of nitrate ions, NO3- in 2 mol of Fe(NO3)3?
[Av = 6.02 x 1023)
1.204 x 1024
1.806 x 1024
3.010 x 1024
3.612 x 1024
What is the number of atoms in 0.5 mol of ammonia gas, NH3?
[Av = 6.02 x 1023]
6.02x1023
0.5 x 2 x 6.02x1023
0.5 x 4 x 6.02x1023
0.5 x 3 x 6.02x1023
A ballons contains 6.02x1023 of gas particle.
What is the number moles of the gas in the baloon?
0.5 mol
1.0 mol
3.0 mol
6.0 mol
0.58g of substance V is used to improve the taste of a beef steak. What is the number of molecules of substance V?
[RAM V = 116 gmol-1; Av = 6.02x1023]
1.20 x 1026
8.31 x 10-27
3.32 x 10-27
3.01 x 1021
What is the number of nitrogen atoms in 40.0g of NH4NO3?
[RMM NH4NO3 = 80 gmol-1; Av = 6.02x1023]
3.01x1023
6.02x1023
2.42x1023
1.51x1023
What is the mass of oxygen in 88g of carbon dioxide?
[RAM O = 16, C = 12]
16g
32g
50g
64g
3.2 g of gas X occupies 1120 cm3 at STP.
What is the RMM of X?
[Molar vol at STP = 22.4 dm3 mol-1]
16
32
64
72
There are 2 types of gases filled in 2 balloons, A & B
Balloon A - 32g of oxygen gas
Balloon B - 2g of hydrogen gas
Which statement is correct about number of particles in oxygen gas?
[RAM O = 16, H = 1]
Two times more than in hydrogen gas
16 times more than in hydrogen gas
Same as in hydrogen gas
More than in hydrogen gas
Which of the following substances has the highest number of atoms?
0.1 mole of carbon
0.2 mole of zinc
0.3 mole of chlorine gas
0.4 mole of neon gas
200 cm3 of a gas has a mass of 0.15 g at room conditions. What is the molar mass of the gas?
[Molar vol at RT = 24 dm3mol-1]
0.018 g mol-1
18 g mol-1
1.25 g mol-1
12.5 g mol-1
