What is the mass of one molecule of cholesterol, C_2H O? (A) 4.3 times 10^-27 g

Question

What is the mass of one molecule of cholesterol, C_2H O? (A) 4.3 times 10^-27 g (B) 1.7 times 10^-24 g (C) 6.4 times 10^-22 g (D) 2.6 times 10^-3 g which is often used to add banana flavor is foods, contains 64.58% carbon, 10.84% hydrogen, and 24.58% oxygen by mass. What is the empirical formula for acetate? (A) C H O_2 (B) C_6H O (C) C H O_23 (D) C H O What volume of a 0.250 M CH_3CH_2NH_2 solution is required to react to completion with 0.300 L of 0.350 M CH COCl? CH COCl + 2CH_2CH_2NH_2 rightarrow CH_3 CONHCH_3CH_3 + CH_3CH_2NH_3^- + Cl^- (A) 52.5 mL (B) 210 mL (C) 420 mL (D) 840 mL What is the percent yield of O_2 if 46.5 g of C O produces 4.06 g of O_2 (g)? 2 CdO(s) rightarrow 2Cd(s) + O_2(g) (A) 70.1% (B) 35.0% (C) 8.73% (D) 4.46% What is the theoretical yield of AlCl_3 if 2.0 g of Al and 2.0 g of Cl_2 react? 2 Al(s) + 3Cl_2 (g) rightarrow 2AlCl_3 (g) (A) 9.9 g (B) 5.6 g (C) 4.0 g (D) 2.5 g Solid manganese (Mn) is: (A) electrically conductive because the positive and negative ions can transfer electrons. (B) electrically conductive because the valence electrons are delocalized. (C) electrically non-conductive because the electrons are tightly bound to the manganese nuclei. (D) electrically non-conductive because the solid is composed of only one element. Which Lewis structure is correct for urea (H_2NC(O)NH_2)? A molecule with 18 valence electrons is composed of only p-block elements and has a central atom X surrounded by two identical atoms Y. What is the approximate Y-X-Y bond angle? (A) 180 degree (B) 120 degree (C) 109 degree (D) 90 degree

Explanation / Answer

Q15.

m = 750 g of sample has 4.4 mg of arsenic

find concentration in ppm

ppm = mg of solute / kg solution

ppm = 4.4 / 0.750 = 5.866

best answer is 5.0 ppm, D

Q16.

m = 1.95 g of NaNO3

disolved in V = 500 mL = 0.5 L

find M

M = mol/V = mass/MW / V = (1.95/85)/0.5 = 0.04588 mol per liter

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