Why is enthalpy important?
1 answer:
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Answer:
139.13
Explanation:
The average atomic mass of the element Likhitium is the sum of the relative abundance of all the isotopes of Likhitium.
We obtain the relative atomic mass of Likhitium as follows;
(44.7/100 * 138) + (52.3/100 * 139) + (0.5/100 * 140) + (2.5/100 * 141)
61.7 + 73.2 + 0.7 + 3.53 = 139.13
Hence the relative abundance of Likhitium is 139.13
2075g of XeF₆ is present in 8.46 moles of XeF₆
<u>Explanation:</u>
Given:
XeF₆ is xenon hexafluoride
number of moles of XeF₆ is 8.46
Mass of XeF₆ present, m = ?
We know,
Molecular weight of XeF₆, M is 245.28 g/mol
and
number of moles, n = mass of XeF₆ present / molecular weight of XeF6
Therefore, 2075g of XeF₆ is present in 8.46 moles of XeF₆