Question

In a stick of chalk carbon is 3 g what is the weight of the chalk stick​

Answer 1

weight of chalk = 25g

Explanation:

let chalk contains 10x calcium, 3x carbon, 12x oxygen.

percentage of carbon in the chalk:

= 3x x 100

10x + 3x + 12x

= 3x ( 100 )

25x

= 3 (4)

= 12%

Now, we know that carbon has 12% of chalk.

weight of carbon = 12% x weight of chalk. ------------- equation

plugin values into the equation:

3 = 12% (weight of chalk)

3 = 12 (weight of chalk)

100

12 (weight of chalk) = 3

100

weight of chalk = 3 (100)

12

weight of chalk = 25g

Answer 2

Hence the weight of chalk stick is 25 g.

Explanation:

Let the weight of a stick be x gm.

12% of x=3

(12/100)*x=3

x=3*(100/12)=25 g