Question

If 1 mole of XO3 contains the same number of atoms as 72 g of XH4, what is the relative atomic mass of X?

Answer 1

may i help you? @kryton1212

Answer 2

but the answer is 86

Answer 3

If 1 mole of XO3 contains the same number of atoms as 72g of XH4, what is the relative atomic mass of X?
1 mole of XO3 contains 4 moles of atoms.
72g = 4 moles of atoms x 1molecule / 5 atoms = 0.8 moles of molecules = 0.8 moles XH4.
72g / 0.8moles = a molar mass of 90g/mole.
Therefore the molar mass of X = 90-4 = 86g/mole for X.

Answer 4

got it!! @kryton1212

Answer 5

got it, thanks

Answer 6

welcome