Question

if one mole of carbon atoms
weighs 12 grams what is the
mass (in grams) of I atom of carbon
Which has more number of
atoms, 100 grams of sodium or
100 grams of iron given atomic
mass of Na= 23 Fe=56 u​

Answer 1

1. Explanation:

$1mol = 6.022 \times {10}^{23} atoms \\ 1mol = 12g \\ 6.022 \times {10}^{23} atoms = 12g \\ \\ for \: 1atom = \frac{12}{6.022 \times 10^{23} } \\ = 2 \times 10 {}^{ - 23} g(approx)$

2. Case

The species having more no of mole will have more no of atoms..

$mol = \frac{given \: mass}{molar \: mass} \\ \\ for \: sodium = \frac{100}{23} = 4.34mol \\ atoms = 4.34 \times n\\ \\ for \: iron \: = \frac{100}{56} = 1.78mol \\ atoms = 1.78 \times n \\ \\ n = avagadro \: number$

So sodium(Na)has more no of atoms..

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