A sample of helium gas collected at a pressure of 0.578 atm and a temperature of 297 K is found to occupy a volume of 530. milliliters. How many moles of He gas are in the sample? _____ mol

we have:

n = (P*V)/(R*T) = (0.578 * 0.530)/(0.08206*297)= 0.0126 mol of He2 gas

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