Consider an unknown organic compound C_x H_y O_z If the compound is found to con

Question

Consider an unknown organic compound C_x H_y O_z If the compound is found to contain 40.0% carbon and 6.71% hydrogen, what is its empirical formula? a. C_2 H_2 O b.C_3 H_6 O_3 c. C_4 H_7 O_2 d. CH_2 O If a 0.320 mole sample of the compound weighs 28.8 g. what is its molecular formula? a. C_3 H_6 O_3 b. C_2 H_4 O c. C_2 H_4 O_2 d. C_6 H_7 O_2 Consider a broker of water that has been boiling for several minutes. Which picture shown best represents the particles that are generated as water changes phases. Consider the chemical reaction A + B rightarrow C. Imagine that you go into the lab and react 3.00 of A with 3.00 g of B. If you produce 4.05 g of product and the yield of the reaction is 76% then the theoretical yield for the reaction is __ and the actual yield is __. a. 6.00 g and 4.05 g b. 4.05 g and 3.08 g c. 4.05 g and 5.34 g d. 5.34 g and 4.05 g

Explanation / Answer

1) moles C = 40/12 = 3.33 mol

moles H = 6.71/1 = 6.71 mol

moles O = (100 - 40 - 6.71)/16 = 3.33 mol

Divide by smallest factor,

C = 3.33/3.33 = 1

H = 6.71/3.33 = 1

O = 3.33/3.33 = 1

Empirical formula = CH2O

d. CH2O

2) molar mass of compound = 28.8 g/0.320 mol = 90 g/mol

So the formula of compound is,

a. C3H6O3

3) Of the given pictures, the best representation of change of water phase,

(b)

4) The theoretical yield = 4.05 x 100/76 = 5.34 g

d. 5.34 g and 4.05 g

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