11.052002

Which compound is formed from its elements by an exothermic reaction at 298 K and 101.3 kPa?

Mcdonalds880 Chemistry 1 7

Which compound is formed from its elements by an exothermic reaction at 298 K and 101.3 kPa?

Posted by Mcdonalds880 | Posted at May 11, 2002 | Categories: Chemistry

Answers

DestinedForDestiny
DestinedForDestiny

STP means standard temperature and pressure at 0°C (273K) and 1 atm (atmosphere). The density of the unknown gas is 0.63 gram per liter. The deal gas equation is PV = nRT. The n is the numer of moles and can be represented as mass of the gas, m, divided by the molar mass, c.  so we have,   PV = nRT PV = (m/c)RT Since the density is d = m/V Pc = (m/V)RT Pc = dRT c = drT/P   substitute the values into the equation, c = [(0.63g/L)(0.08206 L-atm/mol-K)(273K)]/(1atm) c = 14.11 g/mol

May 11, 2002 07:43

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