HCN gas is fatal at concentrations of 1 part per 500 by volume and is very...

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

Solutions

Expert Solution

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

queen_honey_blossom answered 2 years ago

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