1.) Predict if one or more precipitates will form when aqueous solutions of pota

Question

1.) Predict if one or more precipitates will form when aqueous solutions of potassium nitrate (KNO3) and sodium hydroxide (NaOH) are mixed.

2.) Predict if one or more precipitates will form when aqueous solutions of ammonium carbonate ((NH4)2CO3) and manganese(II) nitrate (Mn(NO3)2) are mixed.

3.) If 3.38×104 liters of water in a storage tank contains 2.36 grams of Ag, what is the contaminant level in ppm?

4.) When N2(g) reacts with O2(g) to form N2O(g), 19.6 kcal of energy are absorbed for each mole of N2(g) that reacts. Write a balanced equation for the reaction with an energy term in kcal as part of the equation.

5.) When HCl(g) reacts with O2(g) to form H2O(g) and Cl2(g), 6.84 kcal of energy are evolved for each mole of HCl(g) that reacts. Write a balanced equation for the reaction with an energy term in kcal as part of the equation.

Explanation / Answer

1) no precipitate is formed

2) one precipitate MnCO3 is formed

3) 2.36 g = 2.36 x 10^3 mg

volume = 3.38 x 10^4 L

ppm =  2.36 x 10^3 /3.38 x 10^4

= 0.0698 ppm

4)

2 N2 (g) + O2 (g) ------------------->2 N2O(g) -19.6 kCal

5)

4 HCl + O2 ------------------> 2H2O + 2 Cl2 + 6.84 kcal

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