In: Chemistry
HCN gas is fatal at concentrations of 1 part per 500 by volume and is very dangerous within one hour at a concentration of 1 part per 10,000 by volume. What weight of NaCN is needed to fill a classroom that is 20.0 feet X 15.0 feet X 9.00 feet with HCN at a concentration of 1 part per 10,000 if the HCN is made by the following reaction?
2 NaCN + H2SO4 → Na2SO4 + 2 HCN
2 NaCN + H2SO4 → Na2SO4 + 2 HCN
concentration of HCN allowed in ppm = 1/10^5*10^6 = 10
ppm
volume of ROOM = 20*15*9 = 2700 ft^3 = 7.6455*10^7 ml
HCN required =
10 = (w/(7.6455*10^7))*10^6
w = weight of HCN required = 764.55 grams
No of mol of HCN required = 764.55/27.0253 = 28.3 mol
No of mol of NaCN REQUIRED = 28.3 MOL
mass of NAcN required = 28.3*49.0072 = 1386.9 grams
= 1.39 kg