Answer: D) 1.00 g
Explanation:
According to the Avogadro's law, the volume of gas is directly proportional to the number of moles of gas at same pressure and temperature. That means,

or,

where,
= initial volume of gas = 2.00 L
= final volume of gas = 3.00 L
= initial moles of gas =
= final moles of gas = ?
Now we put all the given values in this formula, we get


Mass of helium =
Thus mass of helium added = (3.00-2.00) g = 1.00 g
For the answer to the question above, let us assume that all Co2 is given off and this are the mass that is lost:
mass at start = 14.00 = 56.70 = 70.70g
<span>mass at end = 64.96g </span>
<span>mass lost = 5.74g </span>
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Solution :
When non volatile solute is added to solvent, vapor pressure gets lowered.
Relative lowering in vapor pressure is given :
=
of solute

= vapor pressure of pure solvent
P = vapor pressure of solution
= mole fraction of solute

= 
= 
Number of moles 


1. For 10 g of 

Ions = 2
It will affect colligative property.

Relative lowering in vapor pressure will be :


2. For 20 g sucrose
Sucrose is non electrolyte, i = 1


3. For 20 g of glucose.
Glucose is a non electrolyte, i = 1


is same in all three solutions.
Hence, lowering in vapor pressure is maximum in
and minimum is Sucrose.
Vapor pressure from lowest to highest.
10 g of
< 20 g of glucose < 20 g of sucrose
The chemical formula of nitrogen dioxide is NO2. It is a brown coloured gas.