First slide

Atomic masses & Molecular Masses

Question

3.011x10²² atoms of an element weight 1.158 gm.The atomic mass of the element is:

Easy

A

10 amu
B

2.3 amu
C

35.5 amu
D

23 amu

Solution

Moles of atoms $= \frac{3 .011 \times 10^{22}}{6 .02 \times 10^{23}} = \frac{1}{20}$
Atomic mass $= \frac{mass}{moles} = \frac{1 .15}{1 / 20} = 23$

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