The compound dimethyl phthalate, used in insect repellents, is composed of carbon, hydrogen, and oxygen and has a molar mass of 194.2 g/mol. A 0.2572-g sample of the compound was burned in a combustion apparatus and 0.583 g of CO2 and 0.119 g of H2O were collected. What is the molecular formula of dimethyl phthalate?

let that person have a turn to speak : )

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally