Write the equation for the reaction of zinc with hydrochloric acid and balance the equation. Find, out the number of molecules of hydrogen gas produced in this reaction, when 1 mole of HCl completely reacts at S.T.P.
[Gram molar volume is 22.4 liters at S.T.P., Avogadro's number is `6.023xx10^(23)`]

write the question for reaction of zinc with hydrochloric acid and balance the equation find out the number of molecules of hydrogen gas produced in this reaction, when 5 mole of HCL completely reacts at STP (Gram molar volume is 22.4 litres at STP, Avogadro’snumber is 6.023 xx 10^(23)

Find out the volume of oxygen gas liberated at S.T.P. on complete decomposition of 6.8 g of H_(2)O_(2) .

Avogadro's lasw states that under conditions of constant temp. and pressure equal volume of gases contain equal no. of particles. Experimental investigation shows that at one atmosphere pressure and a temperature of 273 k, one mole of any gas occupies a volume of which is very close to 22.4 lit. Therefore, the number of moles in any gas sample canbe found by comparing its volume at STP with 22.4 lit. If avagadro's number is 6xx10^(23) molecules then the mass of one atom of oxygen would be

A mole of any substance contains 6.023xx10^(23) particles. The particles may be atom, molecule ions, electron, proton or neutron. One mole of atom is equal to 1 gm -atom which is equal to atomic weight of atom. 1 gm molecule of any gas is 1 mole of gas whose volume is 22.4 litre at N.T.P. The volume of 3.011xx10^(23) atoms of hydrogen gas at N.T.P. is

A mole of any substance contains 6.023xx10^(23) particles. The particles may be atom, molecule ions, electron, proton or neutron. One mole of atom is equal to 1 gm -atom which is equal to atomic weight of atom. 1 gm molecule of any gas is 1 mole of gas whose volume is 22.4 litre at N.T.P. Mass of 1 atom of an element X_(2) is 6.64xx10^(-23)gm . Molecular weight of X_(2) is

Assertion (A) : 1 c.c. of Nitrogen at STP contains 2.69xx10^(19) molecules. Reason (R ) : Molar volume of an ideal gas at STP contains Avogadro number of molecules.

When we concept that one mole of a substance contains the same numbers of elementary entities or one mole of any other substance, we don’t actually need to know what that number is. Sometimes however we will need to work with the actual number of elementary entities in a mole of substance. This number is called Avogadro.s number. N_(A)=6.022137xx10^(23) molecules The unit mol^(-1) which we read as per mole signifies that a collection of N_(A) molecular level entities is equivalent to one mole at the macroscopic level. For example a mole of carbon contains 6.02xx10^(23) atoms of C. A mole of oxygen gas contains 6.02xx10^(23) molecules of O_(2) . The number of atoms present in 8 g of ozone is

Assertion (A): 8 gm of CH_4 occupies 11.355 of volume at S.T.P. Reason (R): 1 mole of any gas at S.T.P. ocupies 22.711 lit.