kerrum75

2021-12-22

A mass of 135 g of a certain element is known to contain
$30.1×{10}^{23}$
atoms. What is the element?

twineg4

Expert

A mass of 135 gram of certain element contain $30.1×{10}^{23}$ atoms.
The number of moles of certain element is given by,
$=\frac{30.1×{10}^{23}}{6.022×{10}^{23}}$
$=5$ The mass per mole (atomic mass) of certain is given by,
$=\frac{135}{5}$
$=27$
From periodic table we can conclude that element having 27 as atomic mass is aluminium
Hence
The element is aluminium

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