Calculate the number of molecules present in 0.5 moles of CO2 ?

Calculate the number of atoms in 0.25 mole atoms of carbon

Calculate the number of atoms in 0.2 mole of sodium (Na).

Calculate the number of atoms in 0.20 mole molecules of oxygen

A ballon has 5.0 g mole of helium at 7^@C calculate the number of atoms of helium in the ballon.

Calculate the total number of electrons present in 1 mole of methane.

9 moles of "D" and 14 moles of E are allowed to react in a closed vessel according to given reactions. Calculate number of moles of B formed in the end of reaction, if 4 moles of G are present in reaction vessel. (percentage yield of reaction is mentioned in the reaction) Step -1 3D+4E 80%rarr5C+A Step-2 3C+5G 50%rarr 6B+F

, At time t=0, intial mole of A is 1. Overall half time of the reaction is 15 days. Then calculate the number of mole of C after 45 days if the raio of k_(1):k_(2):k_(3) is 4:2:1

An ideal transformer has 5,000 turns on its primary coil . It is to be used to convert a mains supply of 230 V.to an alternating voltage having a peak value of 9.0 V. Calculate the number of turns on the secondary coil.

0.1 mole of N_(2O_(4)(g) was sealed in a tude under one atmospheric conditions at 25^(@)C Calculate the number of moles of NO_(2)(g) preesent , if the equilibrium N_(2)O_(4)(g)hArr2NO_(2)(g)(K_(P)=0.14) is reached after some time :