I know the answer is \"D\" but i don\'t know how they got that answer. CHM 4. Sp

Question

I know the answer is "D" but i don't know how they got that answer. CHM 4. Spring 2017 10 am Exam #3 Name: atmos choose the best answer to each question. You must enter into your clicker f to be counted. You can keep this your answer your cho exam when you leave; so if you also identify answers on this you be able to check answer after class. Each questio have a letter students caught will receive grade of this exam and describing the incident placed in their permanent academic file. Good Lu 1) What is the molar mass of copper(III) thiosulfate? A) 463.5 g/mol B) 175.7 g/mol C) 400.0 g/mol D) 463 52 g/mol E) 175.69 g/mol F) 399.97 g/mol Which of the following statements about is true? A) Acids generate OH- ions when added to water. B) Redox reactions require oxygen as a reactant. C) are commonly found in foods such as lemons and vinegar. D) combustion reactions generally produce water and a salt. E) strong base. electrons. F) Reduction is the gain of electrons; oxidation is the loss of inn of What is the coefficient in fro

Explanation / Answer

Copper (III) thiosulfate seems to be a hypothetical compound where the valence of copper is III and that of thiosulfate anion is II. Write down the formula of the compound as Cu2(S2O3)3.

The atomic masses are:

Cu = 63.546

S = 32.065

O = 15.9994

The molar mass is [2*(atomic mass of Cu) + 3*(2*atomic mass of S + 3*atomic mass of O)] = [2*63.546 + 3*(2*32.065 + 3*15.9994)] = 463.4766.

The closest answer is 463.52. We express the answer is g/mol and the answer is 463.52 g/mol.

Ans: (D) 463.52 g/mol.

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