1.

Chalk contains calcium carbon and oxygen in the ratio 10:3:12find the percentage of carbon and if carbon is 7gm so what is the weight of chalk stick. Check the question first correctly

Answer»

Step-by-step explanation:

let the amount of carbon, calcium, and oxygen present be 3x,10X and 12x.

total amount =3x+10x+12x=25x

so percentage of carbon will be (3x ÷ 25×) × 100%

this will be equal to 12%.

so amount of carbon present is 12%.

now, 3x=7

x=7/3.

amount of calcium = 10x

= 10 × 7 ÷ 3

= 23.33 g

amount of oxygen

= 12x

=12 × 7 ÷ 3

= 28g

amount of carbon=7g.

so WEIGHT of chalk = 23.33+28+7= 58.33g



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