what does this line mean that "a formula represents 6.022 * 1023 molecules of a substance"
A (in the formula) is Avogadro's constant and its value is 6.022 * 10^23 atoms or molecules.
One mole of any substance contains 6.022×1023 atoms/molecules. Number of molecules of H2SO4 present in 100 mL of 0.02MH2SO4 solution is.............
(a) 12.044×1020 molecules (b) 6.022×1023 molecules
(c) 1×1023 molecules (d) 12.044×1023 molecules