Mercury(ii) oxide (hgo) decomposes to form mercury (hg) and oxygen (o2). the balanced chemical equation is shown below.

2hgo 2hg + o2

the molar mass of hgo is 216.59 g/mol. the molar mass of o2 is 32.00 g/mol. how many moles of hgo are needed to produce 250.0 g of o2?
3.906
7.813
15.63
73.87

15.63 moles of HgO are needed to produce 250.0 g of

Explanation:

According to given balanced equation, 1 mole of is produced from 2 moles of HgO.

Number of moles

So 250 g of

So moles of HgO needed

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

i think it's letter a.