Oxygen is an example of a(n)
1 answer:
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Molarity is the number of moles of solute in one liter of solution whereas molality is the number of moles of solute present in 1 kilo gram of solution.
Molarity is denoted by M and molality denoted by m
Mass of solution
Density of solution = 1.1 g /mL
d = 1.1 = (W_B + W_A) /V
V = 910.11 mL
molarity of solution is:
= 0.0433 /0.910 = 0.0474 M
Thus, moalrity of solution is 0.0474 M
Answer : The energy evolved when it burned was,
Solution :
First we have to calculate the moles of hydrogen gas by using ideal gas equation.
where,
P = pressure of gas = 1 atm
V = volume of gas =
T = temperature of gas =
R = gas constant = 0.0821 Latm/moleK
n = number of moles of gas
Now put all the given values in the above formula, we get the moles of hydrogen gas.
Now we have to calculate the amount of energy evolved.
The combustion reaction of hydrogen will be,
The enthalpy of combustion of hydrogen is -286 KJ/mole. (standard value)
As 1 mole of hydrogen gas burned it evolved energy = -286 KJ
So, of hydrogen gas burned it evolved energy =
Therefore, the energy evolved when it burned was,