I think number 1 is incorrect I believe that answer is D. Number 6 I believe would be B. The rest seem to be correct.
The property of matter that is responsible for electrical phenomena, existing in a positive or negative form.
To calculate the mass of the fuel, we use the formula

Here, m is the mass of fuel, V is the volume of the fuel and its value is
and
is the density and its value of 0.821 g/mL.
Substituting these values in above relation, we get
Thus, the mass of the fuel 247 .94 kg.