+91-8076753736 [email protected]

-->

Atoms And Molecules

Question

Wired Faculty App

Give atomic masses of some common elements.

Solution

Atomic masses of some common elements

Element	Symbol	Mass (u)	Element	Symbol	Mass(u)
Aluminium	Al	27.0	Magnesium	Mg	24.3
Argon	Ar	39.9	Manganese	Mn	54.9
Arsenic	As	74.9	Mercury	Hg	200.6
Barium	Ba	137.3	Neon	Ne	20.1
Boron	B	10.8	Nickel	Ni	58.7
Bromine	Br	79.9	Nitrogen	N	14.0
Cesium	Cs	132.9	Oxygen	O	16.0
Calcium	Ca	40.1	Phosphorus	P	31.0
Carbon	C	12.0	Platinum	Pt	195.1
Chlorine	Cl	35.5	Potassium	K	39.1
Chromium	Cr	52.0	Silicon	Si	28.1
Cobalt	Co	58.9	Silver	Ag	107.9
Copper	Cu	63.5	Sodium	Na	23.0
Fluorine	F	19.0	Sulphur	S	32.1
Gold	Au	197.0	Tin	Sn	118.7
Helium	He	4.0

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