The work has not been graded but I like the output that was submitted to me. Is it possible for the same prof to do the next assignment I will be submitting? If possible, I will greatly appreciate it.
Question:In Experiment 9, a 1.05 g sample of a mixture of NaCl (MW 58.45) and NaNO2 (MW 69.01) is reacted with excess sulfamic acid. The sample is 40.00% by mass NaNO2. Only NO21- reacts according to the equation below. The nitrogen gas that is formed is collected over water at a temperature of 22.0°C and the barometric pressure on the day of the experiment was 750.0 mm Hg. The vapor pressure of water at 22.0°C is 19.8 mm Hg. What is the volume of nitrogen collected?
NO21- (aq) + HSO3NH2 ® HSO41-(aq) + H2O(l) + N2(g)
(a) 149 mL (b) 384 mL (c) 376 mL
(d) 75.0 mL
34. A 0.100 g sample of phosphoric acid (MW 99.0 g/mol), a tri-protic acid, requires 35.0 mL of a NaOH solution for neutralization. What is the molarity of the NaOH solution?
(a) 0.0433 M (b) 0.0289 M (c) 43.3 M
(d) 9.62×10−3 M
37. An engineering student is conducting a calorimetry experiment. She has previously determined that the heat capacity of the calorimeter itself is 159 J/ºC. In the experiment she mixes 50.0 mL of 2.03 M Ca(OH)2 and 50.0 mL of 1.98 M HCl(aq) according to the equation below. The temperature increases from 25.0 ºC to 35.0 ºC. The density of the CaCl2(aq) solution produced is 1.04 g/mL and the specific heat of the solution is 3.93 J/g-ºC. What is q (in units of J) for the reaction in the calorimeter? (NOT J/mol)
Ca(OH)2(aq) + 2 HCl(aq) ® CaCl2(aq) + 2 H2O(l)
(a) +4.09×103 J 3 (c) +5.68×103 J
(d) -4.09×102 J (e) -5.74×105 J
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