wk 2 and 3 probkems chem133

You need to:

show your work with the solution (use an embedded image or the Σ Graphical Equation button on the Text Editor), and explain in text form how you approached and worked through the problem.

explain in the text how you approached and worked through the problem.

1.86

The mercury content of a stream was believed to be above the minimum considered safe—1 part per billion

(ppb) by weight. An analysis indicated that the concentration was 0.68 parts per billion. What quantity of mercury in

grams was present in 15.0 L of the water, the density of which is 0.998 g/ml? (1 ppb Hg = 1 ng Hg

1 g water)

1.78

 Many chemistry conferences have held a 50-Trillion Angstrom Run (two significant figures). How long is this

run in kilometers and in miles? (1 Å = 1 × 10−10 m)

2.55

Write the formulas of the following compounds:

(a) chlorine dioxide

(b) dinitrogen tetraoxide

(c) potassium phosphide

(d) silver(I) sulfide

(e) aluminum nitride

(f) silicon dioxide

2.43

Write a symbol for each of the following neutral isotopes. Include the atomic number and mass number for

each.

(a) the alkali metal with 11 protons and a mass number of 23

(b) the noble gas element with 75 neutrons in its nucleus and 54 electrons in the neutral atom

(c) the isotope with 33 protons and 40 neutrons in its nucleus

(d) the alkaline earth metal with 88 electrons and 138 neutrons

You need to:

show your work with the solution (use an embedded image or the Σ Graphical Equation button on the Text Editor), and explain in text form how you approached and worked through the problem.

explain in the text how you approached and worked through the problem

3.64

3.65

64. What is the final concentration of the solution produced when 225.5 mL of a 0.09988-M solution of Na2CO3 is

allowed to evaporate until the solution volume is reduced to 45.00 mL?

65. A 2.00-L bottle of a solution of concentrated HCl was purchased for the general chemistry laboratory. The

solution contained 868.8 g of HCl. What is the molarity of the solution?

4.66

Citric acid, C6H8O7, a component of jams, jellies, and fruity soft drinks, is prepared industrially via

fermentation of sucrose by the mold Aspergillus niger. The equation representing this reaction is

C12 H22 O11 + H2 O + 3O2 ⟶ 2C6 H8 O7 + 4H2 O

4.83

83. A sample of gallium bromide, GaBr2, weighing 0.165 g was dissolved in water and treated with silver nitrate,

AgNO3, resulting in the precipitation of 0.299 g AgBr. Use these data to compute the %Ga (by mass) GaBr2.

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