How much volume of oxygen at STP in liters required to burn 4g of methane gas completely?
11.2
5.6
2.8
8
A mixture containing 2 mol each of H2 and O2 is ignited so that water is formed. The amount of water formed is
18g
36g
1.8g
The oxygen obtained from 72 kg of water is
72 kg
46 kg
50 kg
64 kg
One atom of an element weights 1. 8 × -1022g, its atomic mass is
29.9
18
108. 36
154
In a given sample of H2O2 each 100ml of solution contains 68 mg of H2O2. The molarity of the solution is
0.02m
0.2m
2m
20m
1 g atom N2 represents
6.02 × 1023 N2 molecules
22. 4 L of N2 at STP
11. 2 L of N2 at STP
28 g of N2
What is the mass of 1 mole of electron?
6.02 × 1015
8.1 × 1022
0.55 mg
7. 52 × 1023
The largest number of molecules is in
54g of N2O5
28g of CO2
34g of H2O
46 g of CH3OH
Gram molecular volume of oxygen at STP is
22400 cm3
11200 cm3
11300 cm3
224 cm3
32g of O2, 2g of H2, 28g of N2 at NTP, occupy separately a volume of
1L
2L
22. 4L
2. 24L
