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"One mole of all substances contain the ...

"One mole of all substances contain the same number of specified particles".
a. Justify the statement.
b. How to connect mole, gram atom and gram mole?
c. What is the relation between mole and volume?
d. Calculate the number of mole of a gas in
i. 44.828L at STP ii. 11.207ml at STP

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