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Recent questions tagged mole-concept-and-molar-masses
Questions
$0.005\;cm$ thick coating of silver is deposited on a plate of $0.5 \;m^2$ area. The number of silver atoms deposited on the plate are (atomic mass of silver $=108$ , and its density $=7.9g cm^{-3}$
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Apr 1, 2014
by
meena.p
1
answer
A hydrocarbon contains $85.7 \%C$ If $42\;mg$ of the compound contains $3.01 \times 10^{20}$ molecules, the molecular formula of the compound is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Apr 1, 2014
by
meena.p
1
answer
$1.12\;mL$ of a gas is produced at STP by the action of $4.12\;mg$ of alcohol ROH with methyl magnesium iodide. The molecular mass of alcohol is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
difficult
asked
Apr 1, 2014
by
meena.p
1
answer
Two Containers P and Q of equal volume (1 litre each) contain 6g of $O_2$ and $SO_2$ respectively at $300\;k$ and 1 atmosphere then,
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 31, 2014
by
meena.p
1
answer
When a sample of human blood is diluted $200$ times its initial volume and microscopically examined in a layer $0.10\;mm$ thick , an average of $30\;RBC$ are found in $100 \times 100 $ micrometer square. The number of RBC in $1 \;mm^3$ of undiluted blood is
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
jeemain
physical-chemistry
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
difficult
asked
Mar 31, 2014
by
meena.p
1
answer
What quantity of limestone $(CaCO_3)$ on heating will give $56\;kg$ of $CaO$?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 31, 2014
by
meena.p
1
answer
The Loschmidt number is the number of
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 31, 2014
by
meena.p
1
answer
If $N_A$ is Avogadro's number then number of valence electrons in $4.2\;g$ of nitride ions $(N^{3-})$ is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
difficult
asked
Mar 31, 2014
by
meena.p
1
answer
The atomic weights of two elements A and B are 40 and 80 respectively . If xg of A contains y atoms, how many atoms are present in $2x\;gram$ of B?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
easy
asked
Mar 28, 2014
by
meena.p
1
answer
The charge on 1 gram ion of $Al^{3+}$ is :
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 28, 2014
by
meena.p
1
answer
A plant virus is found to consists of uniform cylindrical particles of $150 A^{\circ}$ in diameter and $5000\;A^{\circ}$ long. The specific volume of the virus is $0.75\;cm^3/g$ If the virus is considered to be a single particle , find its molar mass.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
difficult
asked
Mar 28, 2014
by
meena.p
1
answer
The numerical value of N/n (where N is the number of molecules in a given sample of gas and n is the number of moles of the gas) is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
easy
asked
Mar 26, 2014
by
sreemathi.v
1
answer
In the reaction,$4NH_3+5O_2\rightarrow 4NO+6H_2O$ when one mole of ammonia and one mole of oxygen are made to react completely then
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
easy
asked
Mar 26, 2014
by
sreemathi.v
1
answer
Which of the following has the smallest number of molecules?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
difficult
asked
Mar 25, 2014
by
sreemathi.v
1
answer
A certain compound has the molecular formula $X_4O_6$.If 10.0g of compound contains 6.06g of X,the atomic mass of $X$ is
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 25, 2014
by
sreemathi.v
1
answer
A solution contains $1.2046\times 10^{24}$ hydrochloric acid molecules in one $dm^3$ of the solution.The strength of the solution is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 25, 2014
by
sreemathi.v
1
answer
The weight of one molecule of a compound $C_{60}H_{122}$ is
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 25, 2014
by
sreemathi.v
1
answer
0.078g of a hydrocarbon occupy 28.414mL of volume at S.T.P.The empirical formula of the hydrocarbon is CH.The molecular formula of hydrocarbon is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
difficult
asked
Mar 25, 2014
by
sreemathi.v
1
answer
19.7Kg of gold was recovered from a smuggler. How many atoms of gold were recovered? ( at. mass. of Au = 197 )
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
easy
asked
Mar 25, 2014
by
sreemathi.v
1
answer
A signature written with carbon pencil weighs 1mg.What is the number of carbon atoms present in signature?
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 25, 2014
by
sreemathi.v
1
answer
Two grams sulphur is completely burnt in oxygen to form $SO_2$.In this reaction.What is the volume (in litres) of oxygen consumed at S.T.P?(At.mass of S and O are 32 and 16 respectively.)
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
easy
asked
Mar 25, 2014
by
sreemathi.v
1
answer
Volume occupied by 4.4g of $CO_2$ is
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
easy
asked
Mar 25, 2014
by
sreemathi.v
1
answer
X and Y are two elements which form $X_2Y_3$ and $X_3Y_4$.If 0.20mol of $X_2Y_3$ weighs 32.0g and 0.4mol of $X_3Y_4$ weighs 92.8g.The atomic weights of X and Y are respectively
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
difficult
asked
Mar 25, 2014
by
sreemathi.v
1
answer
The number of gram atoms of oxygen present in 0.3 gram mole of $H_2C_2O_4.2H_2O$(oxalic acid) is
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
easy
asked
Mar 25, 2014
by
sreemathi.v
1
answer
If $N_A$ is the Avogadro's number then number of valence electrons in 4.2g of nitride ion($N^{3-})$ is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 25, 2014
by
sreemathi.v
1
answer
At STP ( standard temperature and pressure ) 40L of $CO_2$ contains
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 25, 2014
by
sreemathi.v
1
answer
If the Avogadro's number is $1\times 10^{23}$ mol$^{-1}$ then the mass of one atom of oxygen would be
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 25, 2014
by
sreemathi.v
1
answer
Chemical reactions involve interaction of atoms and molecules.A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses.To handle such large numbers conveniently,the mole concept was introduced.This concept has implications in diverse areas such as analytical chemistry,biochemistry,electrochemistry and radiochemistry.The following example illustrates a typical case involving chemical/electrochemical reaction.A H.O molar aqueous solution of NaCl is prepared and 500ml of this solution is electrolysed.This leads to the evolution of chlorine gas at one of the electrodes(atomic mass:Na=23,Hg=200;1 faraday=96500 coulombs).If the cathode is a Hg electrode,the maximum weight (g) of amalgam formed from this solution is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 25, 2014
by
sreemathi.v
1
answer
Chemical reactions involve interaction of atoms and molecules.A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses.To handle such large numbers conveniently,the mole concept was introduced.This concept has implications in diverse areas such as analytical chemistry,biochemistry,electrochemistry and radiochemistry.The following example illustrates a typical case involving chemical/electrochemical reaction.A H.O molar aqueous solution of NaCl is prepared and 500ml of this solution is electrolysed.This leads to the evolution of chlorine gas at one of the electrodes(atomic mass:Na=23,Hg=200;1 faraday=96500 coulombs).The total number of moles of chlorine gas evolved is:
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 25, 2014
by
sreemathi.v
1
answer
What volume of $CO_2$ will be liberated at NTP if 1.2g of carbon is burnt in excess of oxygen?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 25, 2014
by
sreemathi.v
1
answer
A compound possesses 8% sulphur by mass.The least molecular mass is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
easy
asked
Mar 25, 2014
by
sreemathi.v
1
answer
The number of atoms in 4.25g of $NH_3$ is approximately
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
difficult
asked
Mar 25, 2014
by
sreemathi.v
1
answer
Number of atoms in 558.5 g Fe (at.wt of Fe=$55.85gmol^{-1})$ is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
difficult
asked
Mar 21, 2014
by
sreemathi.v
1
answer
From 392mg of $H_2SO_4,1.204\times 10^{21}$ molecules are removed.How many moles of $H_2SO_4$ are left?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 21, 2014
by
sreemathi.v
1
answer
There are as many notes as number of oxygen atoms in 24.8g $Na_2S_2O_3.5H_2O$ (molecular weight =$248gmol^{-1})$.A note-counting machine counts 48 million notes per day.Days taken to count these notes are
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 21, 2014
by
sreemathi.v
1
answer
If $0.50$ mol of $Bacl_2$ is mixed with $0.20$ mol of $Na_3PO_4$ , the maximum number of moles of $Ba_3(PO_4)_2$ that can be formed is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
difficult
asked
Mar 21, 2014
by
meena.p
1
answer
How many moles of electron weight one kilogram ?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 21, 2014
by
meena.p
1
answer
Which has the maximum number of atoms?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 21, 2014
by
meena.p
1
answer
The largest number of molecules is in
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 21, 2014
by
meena.p
1
answer
Insulin contains 3.4% sulphur.The minimum mol weight of insulin is :
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q51
easy
asked
Jan 9, 2014
by
sreemathi.v
1
answer
For the reaction :$A+2B\rightarrow C$,5 mole of A and 8 mole of B will produce
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q40
easy
asked
Jan 8, 2014
by
sreemathi.v
2
answers
If $0.5$ mole of $BaCl_2$ is mixed with 0.2 mole of $Na_3PO_4$,the maximum number of moles of $Ba_3(PO_4)_2$ that can be formed is :
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q39
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
10 mole of $SO_2$ and 15 mole of $O_2$ were passed over catalyst to produce 8 mole of $SO_3$.The ratio of $SO_2$ and $SO_3$ moles in mixture is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q36
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
How many moles of $KI$ are needed to produce 0.4moles of $K_2HgI_4$?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q35
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
Number of $K^+$ ions present in one litre of M/5 $KMnO_4$ solution are :
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q32
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
0.75 mole of solid $A_4$ and 2 mole of gaseous $O_2$ are heated to react completely in sealed vessel to produce only one gaseous compound B.After the compound is formed the vessel is brought to initial temperature,the pressure is found to half the initial pressure.What is molecular formula of compound?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q33
difficult
asked
Jan 7, 2014
by
sreemathi.v
1
answer
A mixture of ethane $(C_2H_6)$ and ethene $(C_2H_4)$ occupies 40 litre at 1.00atm and at 400k.The mixture reacts completely with 130g of $O_2$ to produce $CO_2$ and $H_2O$.Assuming ideal gas behavior ,Calculate the mole fractions of $C_2H_4$ and $C_2H_6$ in the mixture.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q14
difficult
asked
Jan 6, 2014
by
sreemathi.v
1
answer
A mixture in which the mole ratio of $H_2$ and $O_2$ is 2 : 1 is used to prepare water by the reaction $2H_2(g)+O_2(g)\rightarrow 2H_2O(g)$.The total pressure in the container is 0.8atm at $20^{\large\circ}C$ before the reaction.Determine the final pressure at $120^{\large\circ}C$ after reaction assuming 80% yield of water.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q6
difficult
asked
Nov 6, 2013
by
sreemathi.v
1
answer
A mixture of $HCOOH$ and $H_2C_2O_4$ is heated with Conc.$H_2SO_4$.The gas produced is collected and on treating with KOH solution the volume of the gas decreases by $\large\frac{1}{6}$th.Calculate molar ratio of two acids in original mixture.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q1
difficult
asked
Oct 31, 2013
by
sreemathi.v
1
answer
Calculate the weight of iron which will be converted into its oxide by the action of 18g of steam
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q22
easy
asked
Oct 31, 2013
by
sreemathi.v
1
answer
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