Question

Chalk conta8ns 3% of carbon, 10% of calcium and 12% of oxygen . find the amount in gram of each of these substances in 1 kg of chalk​

Answer 1

Answer:

Step-by-step explanation:

Q. 102

Chalk contains 10% calcium, 3% carbon and 12% oxygen. Find the amount of carbon and calcium (in grams) in kg of chalk.

Class 7th

NCERT - Exemplar Mathematics

7. Comparing Quantities

Answer :

Given, percentage of calcium in chalk = 10%

Percentage of carbon in chalk = 3%

Percentage of oxygen in chalk = 12%

= 2.5 × 1000 = 2500gm

⇒ Amount of carbon in chalk = 3% of 2500 = × 2500

= 75

⇒ Amount of Calcium in chalk = 10% of 2500 = × 2500

= 250

amount of oxygen= 0.12 x 2500 (sincee 12% of Oxygen is present)

= 300

∴ amount of carbon and calcium respectively is 75 and 250

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