Determine the percent composition by mass of an unknownmixture of sodium nitrite, NaNO2, and sodium chlordie, NaCl, aftercollecting a gas evolved by reaction of NaNO2.
In this experiment you will react a mixture of sodium nitrite,NaNO2, and sodium chloride, NaCl, of unknown composition with anexcess of sulfamic acid, HSO3NH2. The NaCl is unreactive underthese conditions whereas the NaNO2 reacts to form nitrogen gas byfollowing equation."
NO2(aq) + HSO3NH2(aq) --> HSO4(aq) + H2O(l) + N2(g).
You will collect the N2 gas at atmospheric pressure and roomtemperature and calculate from your data the moles of N2, moles ofNaNO2, mass of NaNo2, mass of NaCl and percent composition by massof NaNO2 and NaCl.
Masses, Volumes, temperatures, and pressure
Mass of vial (grams) - 4.3575
Mass of vial and unknown sample (grams) - 4.4636
Initial volume of gas (mL) - 38.7
Final volume of gas (mL) - 21.2
Barometric pressure (mmHg) - 756.4
Room Temperature ( C ) - 27.1 C degress
Mass of unknown sample (grams) - .1033
Volume of N2 gas collected ( mL)
Vapor pressure of water at room temperature - 26.7 Cdegrees
Pressure of dry N2 gas (mmHg) -
Moles of N2 collected (mol) -
Mass of NaNO2 reacted (mol) -
Mass of NaNO2 reacted (grams) -
Percent NaNO2 by mass in unknown sample(%) -
Average percent NaNO2 by mass in unknown sample(%) -
Mass of NaCl in unknown sample (grams) -
Percent of NaCl by mass in unknown sample (%) -
Average percent of NaCl by mass in unknown sample (%) -
If anyone knows how to do even, and they can get me started onthe calculations, I would sincerely appreciate it!
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