A chemist combines 11 grams of sodium with 14 grams of chlorine to produce sodiu

Question

A chemist combines 11 grams of sodium with 14 grams of chlorine to produce sodium chloride. After the reaction, the chemist finds that all the chlorine was used up by the reaction, but 2 grams of sodium remained. How many grams of sodium chloride were formed? For a neutral atom of magnesium-25, fill in the following: number of protons _____ number of neutrons _____ number of electrons _____ Finally, write the designation for this atom using the format: ^A_Z X^C What is the value of Avogadro's number? The name of the scientist who developed the Law of Conservation of Mass is: a. Robert Boyle. b. Antoine Lavoisier. c. Joseph Proust. d. John Dalton. Determine the number of moles in each of the following: 25.0 g of magnesium. 12 mg of gold.

Explanation / Answer

1)

2Na + Cl2 ----------------> 2NaCl

46 g      71g                     117 g

11 g      14 g                       ?

limiting reagent is Cl2

mass of NaCl formed = 14 x 117 / 71

                                 = 23.1 g

2)

protons = 12

neutrons = 13

electrons = 12

12 Mg 25

3)

avagadro's number = 6.023 x 10^23

4) answer : d)

5) moles of Mg = 1.04

    moles of gold = 6.1 x 10^-5

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