Question

Chalk contains calcium carbon and oxygen
8:3:9.
(d) Find the percentage of carbon in chalk.
(6) If a stick of chalk contains 12 calcium, what is the weight of the
a chalk stick
​

Answer 1

here given that

calcium carbon and oxygen are in thr ratio8:3:9

first sum all the percentages 8+3+9 =20

carbon = 3

percentage of carbon = (3/20)*100

                                    =  15 %

if chalk contain 12 calcium so the weighed of the chalk is 12+3+9 = 24