General Chemistry Answers

In the production of Zinc sulfide, 36.8 g of zinc is made to react with 19.4 g of sulfur. 

Zn + S -> ZnS

a. How many grams of ZnS is produced when zinc is completely used up? answer: 54.57 g Zns

b. Which reactant is the limiting reagent? answer: Zn

c. How many grams of the excess reagent are left? answer: 1.28 g S

solution:

A compound contains 18.8% sodium, 29.0% chlorine, and

52.2% oxygen, by mass. If the molar mass of the compound is

122.44 g/mol, determine the empirical and molecular formulas

What is the limiting reactant if 10 moles of NH3 react with 10.0 moles of NO? The desired product is nitrogen gas. 4NH3 + 6NO —> 5N2 + 6H20

1. In the production of Zinc sulfide, 36.8 g of zinc is made to react with 19.4 g of sulfur. Zn +S → ZnS

A. How many grams of ZnS is produced when zinc is completely used up?

B. Which reactant is the limiting reagent?

C. How many grams of the excess reagent are left?

an electromagnetic wave has a frequency of 9.9x10⁷ Hz. what is its wavelength?

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Why is wavelength of radio wave with a frequency of 1.5 x 10 to the seventh power Hz?

How many moles of Oxygen would be necessary to completely react with 52g of Butane?

C-14 has a half-life of 5730 years and its activity in a wood just cut down from a tree of 15.3 disintegrations/min/g carbon. How old is a sample of a wooden artifact which gives 5 disintegrations/min/g carbon? Show your complete solution(10 points)

3. Phosphorus-32 is used in biochemical studies to follow the pathway taken by metabolites. Its half-life is 14.3 days. A vial containing 10 microgram of P-32 is accidentally spilled into a sink. (5 points each)show your complete solution.

a. How long will it take P-32 in the drain to exhibit 68% of its original activity?

b. How many atoms of P-32 remain in the sink after 755 days?