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If a mole is defined to be 3 xx 10^(21) ...

If a mole is defined to be `3 xx 10^(21)` (instead of Avogadro's Number, `6 xx 10^(23)`). What would be the mass of one mole of Argon atoms? [Atomic of zinc, Find gram atoms of aluminium in given mixture?]

A

40 gm

B

200 gm

C

20 gm

D

8 gm

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The correct Answer is:
B
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The number of carbon atoms in exactly 12 g C^(12) is called Avogadro's number , N_(A) (6.022 xx 10^(23)) . One mole is the amount of material which contains Avogradro's number of particle. These definitions emphasize that the mole refers to a fixed number of NA^(+) b Avogadro's number of atoms , electrons to refer to a mole of helium , a mole of electrons , or a mole of NA^(+) by Avogadro's number of atoms, electrons or ions respectively. On the other hand, phrases like "one mole of hydrogen" can be ambiguous , and should be restated as "one mole of hydroden atoms" or " one mole fo hydrogen molecules." But it is a matter of common practice among chemists , however , to let the name of the element stand for its mos common form. Thus one mole of O_(2) is frequently referred to as one mole of oxygen , whereas one moles of O is called one mole of oxygen atoms. Suppose if we take one mole molecules fo H_(2)SO_(4) then it contain 2 moles of H atom 1 mole of S atom and 4 moles of O atom. It can also be said that moles of oxygen molecules is (4)/(2) =2 mole. Sulphur exists in different allotropic forms like S_(2) S_(6) 'and" S_(8) etc. If equal weight of these three ar taken in separate containers , then the ratio of number of atoms present in them is :

One atom of an element X’ weighs 6.644 xx 10^(-23) g. Calculate the number of gram atoms in 80 kg of it.

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