5*1022 atoms of an element weight about 0.9g. Atomic wt of element is

1.	5*1022 atoms of an element weight about 0.9g. Atomic wt of element is
Answer» ANSWER: EXPLANATION: The AVOGADRO's number = 6.022x10^23 1 mole of an element has 6.022x10^23 atoms Number of MOLES in 1.5x10^22 atoms = (1.5x10^22)/(6.022x10^23) = 2.5 x 10^-2 = 0.025 moles Atomic mass = Given mass/Number of moles = 0.9/0.025 = 36 Choice (a)

Answer»

The AVOGADRO's number = 6.022x10^23

1 mole of an element has 6.022x10^23 atoms

Number of MOLES in 1.5x10^22 atoms = (1.5x10^22)/(6.022x10^23)

= 2.5 x 10^-2

= 0.025 moles

Atomic mass = Given mass/Number of moles

= 0.9/0.025

= 36

Choice (a)

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