Calculate the mass and number of moles of dinitrogen difluoride gas that were co

Question

Calculate the mass and number of moles of dinitrogen difluoride gas that were collected. Be sure your answer has the correct number of significant digits.

Dinitrogen difluoride gas is collected at 22.0 degree C in an evacuated flask with a measured volume of 25.0L. When all the gas has been collected, the pressure in the flask is measured to be 0.170atm. Calculate the mass and number of moles of dinitrogen difluoride gas that were collected. Be sure your answer has the correct number of significant digits.

Explanation / Answer

Given that Dinitrogen difluoride is collected at 22.00C in an evacuated flask with a measured volume of 25.0L.

also, the pressure in the flask is measured to be 0.170atm....

we have to find out the number of moles of gas and mass of the gas that is present in the flask..

by using the formula PV = nRT we can find out the number of moles...

where P = pressure of the gas

V = volume of the gas

n = number of moles..

R= gas constant whose value = 8.205 x 10^-2 LatmK-1mol-1...

T = temperature in Kelvins,

thus T = 22 +273 = 295K

thus

PV = nRT

n = PV/RT

n = 0.170 x 25/8.205 x 10^-2 x 295

n = 4.25/2420.475 x 10^-2 = 0175moles

thus, number of moles of dinitrogen diflouride = 0.175moles...

mass of the dinitrogen difluoride can be calculated using the formula..

number of moles = weight/gram molecular weight

thus, 0.175 = weight/66.01

weight = 0.175 x 66.01 =11.5517g

thus, the weight of dinitrogen difluoride in the flask = 11.5517g

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