Answer: c
Explanation: an xray wave does have a higher frequency than an infrared wave.
Answer:
An incendiary fire is when a fire is intentionally started knowing it shouldn't be. And an accidental fire is when a fire is started accidentally or without purposeful intent.
Answer:
pH=4.05
Explanation:
C7H6O2 -> C7H6O- + H+
ka= [C7H6O-] [H+]/[C7H6O2]
During equilibrium
[C7H6O-]= [H+]= x^2
[C7H6O2]=0.12-x
Replace
ka= x^2/0.12-x
6.5 x10^-5= x^2/0.12-x
7.8x10^-6 - 6.5 x10^-5x=x^2
x^2+ 6.5 x10^-5x - 7.8x10^-6
Solution of quadratic equation
x=8.8 x10^-5
pH= -log [H+]= -log 8.8 x10^-5=4.05
Answer : The change in internal energy and change in enthalpy of the gas is 1143.2 J/mol and 1600.5 J/mol respectively.
Explanation :
(a) The formula used for change in internal energy of the gas is:
where,
= change in internal energy = ?
= heat capacity at constant volume =
= initial temperature =
= final temperature =
Now put all the given values in the above formula, we get:
The change in internal energy of the gas is 1143.2 J/mol.
(b) The formula used for change in enthalpy of the gas is:
where,
= change in enthalpy = ?
= heat capacity at constant pressure =
= initial temperature =
= final temperature =
Now put all the given values in the above formula, we get:
The change in enthalpy of the gas is 1600.5 J/mol.