Question

A chemical compound is found to be 18% oxygen by mass. How much of the compound must be decomposed in order to obtain 26 g of oxygen? O A 1518 OB. 1278 Oc. 1448 OD.970 DL 1.208 Res Section

Answer 1

189 of oxygen obtained from = loog of Compound 269 = 100 x 26 18 = 144g of compound is needed to obtain is correct. 1 ug of compound [ 269 of oxygen. Option C Given, V ( density of aluminium - 2.70g/mL Molecular mass og aluminium = 27 g/mol :: Molar volume of aluminium = molar mass density - 27 g/mol 2.70g/m2 = 10.0 mL/mol correct. I option B is Given temp = 615°C .. Kelvin temp. = 615 +273 = 888K Option B is correct.