How many electrons are present in 16g of CH4 ?
6.022 × 1024
6.22 × 1024
6.02 × 1024
6.20 × 1024
The height of a person is 155.01 cm.What is the least count of the scale used?
1
1.0
0.01
0.001
Express 5.607892 to four significant figures and write the result in standard form.
5.657
5.608
5.607
5.609
A solution is prepared by adding 2g of a substance A to 18g of water. Calculate the mass percent of the water. Calculate the mass percent of the solute?
100%
98%
25%
10%
How many mole of methane are required to produce 22g of CO2 (g) after combustion?
.25
.375
0.5
.10
Calculate the number of He atoms in 52 u
4 atoms
12 atoms
13 atoms
52 atoms
The molecular weight of O2 and SO2 are 32 and 64 respectively. At 15oc and 150mm Hg pressure, 1L of O2 contains 'N' molecules. The number of molecules in 2L of So2 under the same conditions of temperature and pressure will be
N/2
N
2N
4N
Example of homogeneous mixture.
Air
Water
Salt solution
none
Calculate the molecular mass of H2O
14u
16u
18u
22u
"All matter is made of atoms which are indivisible and indestructible ultimate particles"
Relative of Atomic mass
Avogadro's Law
None of these
Dalton's Atomic Theory
