Element X in the compound H2XO4 is Selenium (Se).
- The molar mass of the compound; H2XO4 needs to be calculated by dividing the number of moles by its mass as follows:
- Molar mass of H2XO4 = 54.36g ÷ 0.375moles
- Molar mass of H2XO4 = 144.96g/mol
Since, H = 1 and O = 16
1(2) + X + 16(4) = 144.96
2 + X + 64 = 144.96
66 + X = 144.96
X = 144.96 - 66
X = 78.96
- The element that possess an atomic mass of 78.96 is Selenium (Se). Therefore, element X in the compound H2XO4 is Selenium (Se).
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