completely in excess oxygen, and the mass of the products carefully measured: product mass carbon dioxide 11.69 g water 3.19 g Use this information to find the molecular formula of X.

An analytical chemist measures the amount Elements E₁ and E₂ in four samples of an unknown Substance X: mass mass sample of E₁ of E₂ 12.1 g 13.9 g 11.3 g 12.7 g 13.6 g 15.4 g 6.6 g 7.5 g Using this information, answer the questions in the table below. 1 2 3 4 It's known that X contains no elements other than E, and E₂. Is X a pure substance or a mixture? If you don't have enough information to decide, choose can't decide. If you said X is a pure substance, calculate the mass of Element E, the analytical chemist would find in a new 10.0 g sample of X. Round your answer to 2 significant digits. O pure substance O mixture O (can't decide) 0 X S s

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The rotten smell of a decaying animal carcass is partially due to a nitrogen-containing compound called putrescine. Elemental analysis of putrescine indicates that it consists of I 54.50% C, 13.73% H, and 31.77% N. Calculate the empirical formula of putrescine. (Hint: Begin by assuming a 100-g sample and determining the mass of each element in that 100-g sample.)