Question

3 - 12. Find the
(a) Chalk contains calcium, carbon and oxygen in the ratio :
percentage of calcium in chalk.
(b) If in a stick of chalk, carbon is 5 g. what is the mass of the chalk stick?
(a) Calcium : carbon : oxygen = 10:3:12
Total parts - 10 +3 + 12 - 25
Calcium carbon – is and oxygen - 3
Percentage of calcium in chalk - * 100% = 40%
(b) Percentage of carbon in chalk - 33 * 100 = 12%
12% of mass of chalk stick=5 g
Mass of the chalk stick = 5
5 100
12
41.66 $
.. Mass of the chalk stick​

Answer 1

Answer:

25g

Explanation:

7b) Mass of the chalk =

Carbon weight=3 g

percent of carbon in chalk =12%

12% of x = weight of carbon

=12/100*x=3

12x/100=3

x=3*100/12

=25 g