Answer is: empirical formula is Fe₂O₃.
m(Fe) = 7,50 g.
m(iron oxide) = 10,71 g.
n(Fe) = m(Fe) ÷ M(Fe).
n(Fe) = 7,50 g ÷ 55,85 g/mol = 0,134 mol.
m(O) = m(iron oxide) - m(Fe).
m(O) = 10,71 g - 7,50 g = 3,21 g.
n(O) = 3,21 g ÷ 16 g/mol = 0,20 mol.
n(Fe) : n(O) = 0,134 mol : 0,2 mol = 2 : 3.
<span>175.5g
</span>Cl(35.5) x 3 = 106.5
Na(23) x 3 = 69
106.5 + 69 = 175.5g
or
0g because sodium and chlorine are not chemically bonded.
What are the multiple choices?
Chlorofluorocarbons (CFCs) are used generally in aerosols, sprays, perfume, refrigerants, insulation foams and other stuffs. Throughout its applications, the negative impacts weighed more than its benefits. Its greater setback is the contribution to the thinning of the ozone layer which exposes us more with the harmful ultraviolet rays from the sun.
I think it's 12
I just looked it up and they said its 12........
