How many hydrogen atoms are in 89.5 g of
C6H6 ?
Answer in units of atoms.

Solution :

Molar mass of is :

M = 6×12 + 6×1 g

M = 78 g

78 gram of contains molecules.

So, 89.5 gram of contains :

Now, from the formula we can see that one molecule of contains 2 hydrogen atom . So, number of hydrogen atom are :

Hence, this is the required solution.

b

explanation:

mitosis

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