+91-8076753736[email protected]
logo
logo
-->

Atoms And Molecules

Question
CBSEENSC9005070
Wired Faculty App

How many gram atoms of each element are present in 10 g CaCO3?

Solution
Molecular space mass space of space CaCO subscript 3 space equals space 40 plus 12 plus 48 space equals space 100 Moles space of space CaCO subscript 3 space in space 10 space straight g space of space CaCO subscript 3 space equals space 10 over 100 space space equals space 0.1 space mole 1 space space mole space CaCO subscript 3 space contains space space space equals space 1 space straight g space atom space Ca 0.1 space mole space CaCO subscript 3 space contains space equals space 0.1 space straight g space atom space Ca 0.1 space mole space CaCO subscript 3 space contains space equals space 0.1 space straight g space atom space straight C 1 space mole space of space CaCO subscript 3 space contains space equals space 3 space straight g space atoms space of space straight O 0.1 space mole space CaCO subscript 3 space contains space equals space 0.3 space straight g space atoms space of space straight O

Some More Questions From Atoms And Molecules Chapter

When 3.0 g of carbon is burnt in 8.00 g oxygen, 11.00 g of carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.00 g of carbon is burnt in 50.00 g of oxygen ? Which law of chemical combination will govern your answer?

What are polyatomic ions? Give examples.

Write the chemical formulae of the following:

(a) Magnesium chloride
(b) Calcium oxide
(c) Copper nitrate 
(d) Aluminium chloride
(e) Calcium carbonate

Give the names of the elements in the following compounds.

(a) Quick lime
(b) Hydrogen bromide
(c) Baking powder 
(d) Potassium sulphate.

Calculate the molar mass of the following substances:

(a) Ethylene
(b) Sulphur molecule, S8
(c) Phosphorus molecule, P4
(d) Hydrochloric acid, HCl
(e) Nitric acid, HNO3.

What is the mass of:

(a) 1 mole of nitrogen atoms

(b) 4 moles of aluminium atoms

(c) 10 moles of sodium sulphite.

Convert into mole

(a) 12 gm of oxygen gas

(b) 20 gm of water

(c) 22 gm of carbon dioxide.

What is the mass of?

(a) 0.2 mole oxygen atoms.

(b) 0.5 mole of water molecules.

Calculate the number of molecules of sulphur (S8) present in 16 gm of solid sulphur.

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation