What is the relation between gram atoms and gram molecules with moles of a substance?

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Q. Calculate the total number of atoms present in 'M' grams of any substance, if the number of atoms in one molecule of that substance is 'K' and gram molecular weight of the substance is 'W' grams :

Gram Atomic mass is just the atomic mass expressed in grams ...ie, atomic mass with gram as units. Our book says that gram atomic mass and gram atom are the same thing (similarly for gram molecule and gram molecular mass) . But later a formula is given that : Gram atom = mass in grams / Atomic mass [RAM].

There are questions also that use this formula ( similarly for gram molecule) in which we have to find the number of "gram atoms " in a given mass of substance.

So what is the real meaning of gram atom and the formula ( and is is similar for gram molecules) ?

Q. __________________ is the number of times one molecule of the substance is havier than 1/12 the mass of an atom of carbon \[(C^{12}\)].

Q. (a) Calculate the gram molecular mass of water from the values of gram atomic mass of hydrogen and of oxygen.
Gram atomic mass of hydrogen

= 1 g

Gram atomic mass of oxygen

= 16 g

(b) Atoms and molecules are the building blocks of matter. List out any three differences between them.

Q. Calculate the total number of atoms present in '

m

' g of any substance, if the number of atoms in one molecule of that substance is '

k

' and gram molecular weight of the substance is '

w

' g/mol.

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