this is a mc question and the answer is 51.5g/mol.But I don't know how it is derived.
2006-10-14 08:57:52 · 2 answers · asked by ichigokun 1 in Science & Mathematics ➔ Chemistry
please show me a step by step solution..Thank you
2006-10-14 10:52:40 · update #1
Suppose that the Atomic mass of the metal is Am. Atomic mass of oxygen is 16, so if you have 1 mol of the oxide it's mass is:
2*Am + 3*16 = 2*Am + 48 g
Now:
In 100 g of the oxide the 68.4 g are M
In 2*Am + 48 g of the oxide the 2*Am are M
100*2Am = 68.4(2*Am + 48) <=>
200*Am = 136.8*Am + 3283.2 <=>
63.2*Am = 3283.2 <=>
Am = 52 (approx.)
2006-10-14 11:28:20 · answer #1 · answered by Dimos F 4 · 0⤊ 0⤋
O has a molar mass of about 16 g/mol
so 16*3=48
that means (100-68.4) 31.6% of the mass is oxygen.
You know % comp, right? Take it from here
2006-10-14 09:21:45 · answer #2 · answered by Anonymous · 0⤊ 0⤋