Download App

Mole Concept And Stoichiometry — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryMole Concept And Stoichiometry5 Marks
Question
Determine the empirical formula of the compound whose composition by mass is $42\%$ nitrogen$, 48\%$ oxygen and $9\%$ hydrogen.$\ [N=14,O=16,H=1]$
✓

Answer

Element Atomic mass Percentage Relative number of moles  Simplest mole ratio Whole number ratio
$N$ $14$ $42$ $42/14 = 3$ $3/3 = 1$ $1$
$O$ $16$ $48$ $48/16 = 3$ $3/3 = 1$ $1$
$H$ $1$ $9$ $9/1 = 9$ $9/3 = 3$ $3$
So the empirical formula of the compound is $NH_2OH.$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[5 Mark Question Answer]" from Mole Concept And Stoichiometry→Mole Concept And Stoichiometry — all question types→Chemistry STD 10 question papers→ICSE Board STD 10 question papers→ICSE Board question paper generator→

Similar questions

Distinguish between electrolytic methods of reduction and refining ?
→
Calculate the empirical formula of the compound having $37.6\%$ sodium$, 23.1\%$ silicon and $39.3\%$ oxygen.$($Answer correct to two decimal places$) (O = 16, Na = 23, Si = 28)$
→
The compound A has the following percentage composition by mass: $C =26.7\%, O = 71.1\%, H = 2.2\%.$
Determine the empirical formula of $A$.
$($Answer to one decimal place$) \ (H=1,C=12,O=16)$
→
A metal $M,$ forms a volatile chloride containing $65.5\%$ Chlorine. If the density of the chloride relative to hydrogen is $162.5,$ find the molecular formula of the chloride. $[M = 56, Cl = 35.5]$
→
What are the conditions necessary for the formation of covalent molecule? Give their properties.
→
A compound contains $87.5\%$ by mass of nitrogen and $12.5\%$ by mass of hydrogen. Determine the empirical formula of this compound.
→
M is a metal above hydrogen in the activity series and its oxide has the formula $M_2O$. The oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context answer the following:
(i) What kind of combination exists between $M$ and $O$?
(ii) How many electrons and there in the outermost shell of $M$?
(iii) Name the group to which M belongs
(iv) State the reaction taking place in the cathode
(v) Name the product at the anode
→
The gases hydrogen, oxygen, carbon dioxide, sulphur dioxide and chlorine are arranged in order of their increasing relative molecular mass. Given $8 g$ of each gas at $\text{STP},$ which gas will contain the least number of molecules and which gas the most?
→
How would you prepare :
Copper sulphate crystals from a mixture of charcoal and black copper oxide.
→
Draw a labelled diagram and explain the laboratory preparation of hydrogen chioride gas.
→