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« previouS 21 of 22 next » Item 21 Part A Nickel carbonyl, Ni(CO)4 is one of the most toxic substances known. The present maximum allowable concentration in laboratory air during an 8- hr workday is 1 ppb (parts per billion) by volume, which means that there is one mole of Ni(CO)4 for every 10 moles of gas. Assume 24 C and 1.00 atm pressure. What mass of Ni (CO), is allowable in a laboratory that is 12 ft × 20 ft × 11 ft ? Express your answer using two significant figures. | m= 11.8. 103 Submit My Answers Give Up Incorrect; Try Again; 3 attempts remaining Provide Feedback Continue

Explanation / Answer

a)

mass of Ni(CO4) in a V = 12*20*11 = 2640 ft3

1 ft3 = 28.3168 L

total V = 28.3168*2640 =74756.352 L

now..

1 mol of NI(CO)4 per 10^9 mol of gas

note that

PV = nRT

n = PV/(RT) = 1*74756.352 /(0.082*(24+273.15)) = 3068.02 mol of air

note that

1/10^9 mol of Ni(CO)4 is present so

mol of Ni(CO)4 = 1/(10^9) * 3068.022 = 0.000003068

mass = mol*MW = 0.000003068*170.7 = 0.0005237 g = 5.23*10^4 g of Ni(CO)4

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