The following is an example of a renewable source of energy OA.
coal
OB. hydroelectricity
OC.
nuclear energy
OD
petroleum
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OB. Hydroelectricity

Explanation:

Because hydroelectricity is the process where electricity is generated by a motor being rotated by the force or current of water, and according to the laws of the water cycle, water is goes back to where it once was which leads us to conclude that hydroelectricity is a renewable source of energy.

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when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml

the answer is c. nacl