Answer:
there is 2% of hydrogen and 98% of nitrogen (mass percent)
Explanation:
assuming ideal gas behaviour
P*V=n*R*T
n= P*V/(R*T)
where P= pressure=1.02 atm , V=volume=7.47 L , T=absolute temperature= 296 K and R= ideal gas constant = 0.082 atm*L/(mole*K)
thus
n= P*V/(R*T) = 1.02 atm*7.47 L/( 296 K * 0.082 atm*L/(mole*K)) = 0.314 moles
since the number of moles is related with the mass m through the molecular weight M
n=m/M
thus denoting 1 as hydrogen and 2 as nitrogen
m₁+m₂ = mt (total mass)
m₁/M₁+m₂/M₂ = n
dividing one equation by the other and denoting mass fraction w₁= m₁/mt , w₂= m₂/mt , w₂= 1- w₁
w₁/M₁+w₂/M₂ = n/mt
w₁/M₁+(1-w₁) /M₂ = n/mt
w₁*(1/M₁- 1/M₂) + 1/M₂ = n/mt
w₁= (n/mt- 1/M₂) /(1/M₁- 1/M₂)
replacing values
w₁= (n/mt- 1/M₂) /(1/M₁- 1/M₂) = (0.314 moles/3.48 g - 1/(14 g/mole)) /(1/(1 g/mole)-1/(14 g/mole))= 0.02 (%)
and w₂= 1-w₁= 0.98 (98%)
thus there is 2% of hydrogen and 98% of nitrogen
A.contains our solar system
Answer:
Mark me as brain list plz for fun
Explanation:
The picture is blurry
By determining the period that the element is in. For example, Calcium is in period 2 therefore its valence electron is located on energy level 2.
Answer:
As more sodium chloride is dissolved, higher is the boiling point of the solution
Explanation:
The boiling point- the temperature at which the solution boils- will increase as more solute is added. That is a colligative property called <em>boiling point elevation</em>. Colligative propeties are those that depend on the number of particles of solute in a solution. As more solute is added (sodium chloride or NaCl), more particles of solute will be present in the solution and the boiling point of the solution will be higher. The mathematical expression for the boiling point elevation (ΔTb) is the following:
ΔTb= Kb x m
Where Kb is a molal constant and m is the molality of the solution. That expression shows that the elevation of boiling point depends on the concentration of the solute expressed in terms of moles per mass of solution.