$(i)$. Chalk contains calcium, carbon and oxygen in the ratio $10:3:12$. Find the percentage of carbon in chalk.
$(ii)$. If in a stick of chalk, carbon is 3g, what is the weight of the chalk stick?
Solution:
$(i)$. Given ratio$=10:3:12$
Total part$=10+3+12=25$
Part of Carbon$=\frac{3}{25}$
Percentage of Carbon part in chalk$=\frac{3}{25}\times100=12$ %
$(ii)$. Quantity of Carbon in chalk stick$=3\ g$
Let the weight of chalk be $x\ g$.
Then, $12$ % of $x=3$
$\Rightarrow\ \frac{12}{100}\times x=3$
$\Rightarrow x=\frac{3\times100}{12}=25\ g$
Hence the weight of the chalk stick is $25\ g$.
Related Articles
- How is the crushing of chalk a physical change?
- Classify the following as elements or compounds:Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
- Node.js – Chalk Module
- 'If 100 grams of calcium carbonate (whether in the form of marble or chalk) are decomposed completely, then 56 grams of calcium oxide and 44 grams of carbon dioxide are obtained'. Which law of chemical combination is illustrated by this statement?
- What happens if the percentage of carbon-dioxide increases in the air?
- If one mole of carbon atoms weighs 12 grams, what is the mass (in grams) of 1 atom of carbon?
- If 3g of carbon burns in 8g oxygen to produce 11g of carbon dioxide. Then how much carbon dioxide will be produced if 12g of carbon burnt in 32g of oxygen? Which law of chemical combination will govern your answer?
- Discuss the method of separating a mixture containing chalk powder, iron filings and naphthalene.
- How will you separate a mixture of chalk powder and water?
- Chalk dissolved in water is an example of:true solutioncolloidthe suspensionsaturated solution
- Carbon exists in the atmosphere in the form of(a) carbon monoxide only(b) carbon monoxide in traces and carbon dioxide(c) carbon dioxide only(d) coal
- If one mole of carbon atom weighs 12g, what is the mass in grams of 1 atom of carbon?
- What is the source of carbon dioxide in air?
- What type of bonding would you expect between the following pairs of elements?(i) Calcium and Oxygen (ii) Carbon and Chlorine (iii) Hydrogen and Chlorine.
- Which of the following pair of elements represents a mole ratio of 1 : 1?(a) 10 g of calcium and 12 g of magnesium(b) 12 g of magnesium and 6 g of carbon(c) 12 g of carbon and 20 g of calcium(d) 20 g of sodium and 20 g of calcium
Kickstart Your Career
Get certified by completing the course
Get Started