How many electrons make up a charge of -50.0 μc ? express your answer using three significant figures?

3.12 × 10¹⁴ electrons

Explanation:

1 mole of electrons has a charge of -96465 C (Faraday's constant). The moles of electrons that have a charge of -50.0 μc (-50.0 × 10⁻⁶ C) are:

-50.0 × 10⁻⁶ C × (1 mol e⁻/-96465 C) = 5.18 × 10⁻¹⁰ mol e⁻

1 mol of electrons has 6.02 × 10²³ electrons (Avogadro's number). The number of electrons in 5.18 × 10⁻¹⁰ moles of electrons is:

5.18 × 10⁻¹⁰ mol e⁻ × (6.02 × 10²³ e⁻/ 1 mol e⁻) = 3.12 × 10¹⁴ e⁻

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

that's what i got you can count the number of atoms