Answer:
Fossils, Glaciers, Coastlines.
Explanation:
Evidence of plate tectonic theory are fossils, fossils of the same species were found oceans apart. also glaciers evidence of glaciers were found in places with warm climates. coastlines coastlines look like they fit in a puzzle.
Volume= Mass/ Density= 20/184
= 0.108 cubic cm
<u>Answer:</u> The below calculations proves that the rate of diffusion of
is 0.4 % faster than the rate of diffusion of 
<u>Explanation:</u>
To calculate the rate of diffusion of gas, we use Graham's Law.
This law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows the equation:

We are given:
Molar mass of 
Molar mass of 
By taking their ratio, we get:


From the above relation, it is clear that rate of effusion of
is faster than 
Difference in the rate of both the gases, 
To calculate the percentage increase in the rate, we use the equation:

Putting values in above equation, we get:

The above calculations proves that the rate of diffusion of
is 0.4 % faster than the rate of diffusion of 
Answer:

Explanation:

As given in the question that methane(
) is taken excess amount
mass of
depend only on mass of fluorine
mass of
=180 g
mole of
=
=9.47
3 mole of
gives 1 mole of 
so 1 mole will give
mole of 
therefore,
9.47 mole of
will give
mole of 

Answer:a) 0.1 mole. b) 4g. c) 2% d) 196 mL
Explanation: in 200mL , 0.1mole
mw NaOH = 40g/mol —> 4g in 0.1 mole
4g in 200mL so 2g in 100mL
density NaOH = 1g/mL so if 4g in 200 mL, 4mL , 196 mL water