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Recent questions tagged physical-chemistry

The specific heat of a metal is 0.16, its approximate atomic weight would be

asked Mar 26, 2014 by sreemathi.v

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

asked Mar 26, 2014 by sreemathi.v

1 answer

The percentage of nitrogen in urea is about?

asked Mar 26, 2014 by sreemathi.v

1 answer

How many molecules are present in one gram of hydrogen?

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

asked Mar 26, 2014 by sreemathi.v

1 answer

10 $dm^3$ of $N_2$ gas and $10\;dm^3$ of gas at X at the same temperature contain the same number of molecules. The gas $X$ is

asked Mar 26, 2014 by sreemathi.v

1 answer

A sugar syrup of weight 214.2g contains 34.2g of sugar ($C_{12}H_{22}O_{11})$. Calculate (i) Molal concentration and (ii) Mole fraction of sugar in the syrup.

asked Mar 26, 2014 by sreemathi.v

1 answer

Which of the following has the smallest number of molecules?

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

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

asked Mar 25, 2014 by sreemathi.v

1 answer

The weight of one molecule of a compound $C_{60}H_{122}$ is

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

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 )

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?

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.)

asked Mar 25, 2014 by sreemathi.v

1 answer

Assuming fully decomposed,the volume of $CO_2$ released at STP on heating 9.85g of $BaCO_3$ (Atomic mass of Ba=137) will be

asked Mar 25, 2014 by sreemathi.v

1 answer

Volume occupied by 4.4g of $CO_2$ is

asked Mar 25, 2014 by sreemathi.v

1 answer

The percentage of oxygen in NaOH is

asked Mar 25, 2014 by sreemathi.v

1 answer

A gas is found to have formula $[CO]_x$.If its vapour density is 70 then the value of x is

asked Mar 25, 2014 by sreemathi.v

1 answer

In alkaline medium,$KMnO_4$ reacts as follows:$2KMnO_4+2KOH\rightarrow 2K_2MnO_4+H_2O+O$.Therefore,the equivalent weight of $KMnO_4$,will be

asked Mar 25, 2014 by sreemathi.v

1 answer

The relative abundance of two isotopes of atomic weight 85 and 87 is 75% and 25% respectively.The average atomic weight of element is

asked Mar 25, 2014 by sreemathi.v

1 answer

'M' g of an element gave 'N' g of oxide.Equivalent weight of the element is

asked Mar 25, 2014 by sreemathi.v

1 answer

A container of volume V contains 0.28g of $N_2$ gas.If the same volume of an unknown gas under similar conditions of temperature and pressure weighs 0.44g,the molecular mass of the gas is

asked Mar 25, 2014 by sreemathi.v

1 answer

112.0ml of $NO_2$ at STP was liquefied,the density of the liquid being $1.15gmL^{-1}$.Calculate the volume and the number of molecules in the liquid $NO_2$.

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

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

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

asked Mar 25, 2014 by sreemathi.v

1 answer

At STP ( standard temperature and pressure ) 40L of $CO_2$ contains

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

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 charge (coulombs) required for complete electrolysis is

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

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:

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?

asked Mar 25, 2014 by sreemathi.v

1 answer

The specific heat of a metal is 0.11 and its equivalent weight is 18.61.Its exact atomic weight is

asked Mar 25, 2014 by sreemathi.v

1 answer

$6.0\times 10^{20}$ molecules of urea are present in 100ml of its solution .The concentration of urea solution is

asked Mar 25, 2014 by sreemathi.v

1 answer

A compound possesses 8% sulphur by mass.The least molecular mass is

asked Mar 25, 2014 by sreemathi.v

1 answer

The number of atoms in 4.25g of $NH_3$ is approximately

asked Mar 25, 2014 by sreemathi.v

1 answer

5.85g of NaCl is dissolved in 1L of pure water.The number of ions in 1ml of this solution is

asked Mar 25, 2014 by sreemathi.v

1 answer

20g of sample of $Ba(OH)_2$ is dissolved in 50c.c of 0.1N HCl solution.The excess of HCl has titrated with 0.1NaOH.The volume of NaOH used was 20c.c.Calculate percentage of $Ba(OH)_2$ in the sample

asked Mar 24, 2014 by sreemathi.v

1 answer

What is the percentage ionic character of $KCl$ given the following: The dipole moment of $KCl$ is $3.336 \times 10^{-29} \text{coulomb-meter}$. The interatomic distance between $K^{+}$ and $Cl^{-}$ is $2.6 \times 10^{-10}\;m$.

asked Mar 22, 2014 by balaji.thirumalai

1 answer

Which of these molecules have dipole-dipole forces? $(1) \;CO_2 \quad (2) \; CH_2Cl_2 \quad (3)\; CH_4$

asked Mar 22, 2014 by balaji.thirumalai

1 answer

Number of atoms in 558.5 g Fe (at.wt of Fe=$55.85gmol^{-1})$ is

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?

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

asked Mar 21, 2014 by sreemathi.v

1 answer

The atomic weight of Cu is 63.546.There are only two naturally occuring isotopes of copper,$^{63}Cu$ and $^{65}Cu$.The relative abundance of the $^{63}Cu$ isotope must be

asked Mar 21, 2014 by sreemathi.v

1 answer

$2H_2+O_2\rightarrow 2H_2O$.2g $H_2$ and 1g $O_2$ react to form $H_2O$

asked Mar 21, 2014 by sreemathi.v

1 answer

The equivalent mass of chlorine is 35.5 and the molar mass of copper is 63.5.The equivalent mass of copper chloride is 99.0.Hence formula of copper chloride is

asked Mar 21, 2014 by sreemathi.v

1 answer

The equivalent weight of an element is 4.Its chloride has a vapour density 59.25.Then the valency of the element is

asked Mar 21, 2014 by sreemathi.v

1 answer

The reaction , $3Cl_O(aq) \longrightarrow ClO_{3(ag)}^{-}+2 Cl^{-}_ {(aq)}$ is an example of

asked Mar 21, 2014 by meena.p

1 answer

The number of neutrons in dipositive zinc ion with mass number 70 is

asked Mar 21, 2014 by meena.p

1 answer

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