Question

Add Question Here Moddy Remove 51 Multiple Choice 0 points Question Vitamin C contains the elements C,H, and O. It is known to contain 40.9% C and 4.58% H by mass. The molar mass of vitamin C has been found to be about 180 g/mol. The molecular formula for vitamin C is: Answer CH03 C4H6O4 18 52 Multiple Choice 0 points Modiy Remove A compound composed of sulfur and fluorine is found to contain 25.24% by mass of sulfur. If the molar mass of the compound is 254.1 1 gmol what is its molecular Answer ร้า SF 53 Multiple Choice 0 points Modty Remove A 0.5110-g sample of a compound known to contain only carbon, hydrogen, and oxygen was burned in oxygen to yield 0.9495 g of CO2 and 0.1944 g of H20. What is the empirical formula of the compound? Answer CHO 54 True/False 0 points Model Remove Oxides of copper include Cuo and Cu20. You heat 1.51 g of one of these copper oxides in the absence of air and obtain 1.21 g of Cu. True or false: You must have had CuO. Answer True False
Solve with justification please

Answer 1

Finding formula element % of element %/molar mass simple ratio C 40.9 40.9/12 = 3.4 3.4/3.4 = 1 times 3 H = 4.58 4.58/1 = 4.58 4.58/3.4 = 1.34 times 3 O 54.52 54.52/16 = 34 3.4/3.4 = 1 times 3 C rightarrow 3 empirical formula = C_3 H_4 O_3 K rightarrow 4 empirical wt = 3 times 12 + 4 times 1 + 16 times 3 = 88g given molar mass of vitamin c = 180 g/mol molar mass/empirical mass = 180/88 almostequalto 2 therefore molecular formula = 2 times (C_3 H_4 O_3) molecular formula = C_6 H_8 O_6 element % %/molar mass simple ratio S 25.24 25.24/32 = 0.79 0.79/0.79 = 1 F 74.76 74.76/19 = 3.93 3.93.0.79 = 5 \r\n empirical formula = SF_5 empirical mass = 35 + 5 times 19 = 127g given molar mass = 254.11 molar mass/ empirical mass = 254.11/127 = 2 therefore molecular formula = 2(S F_5) = S_2 F_10