A sample of propane occupies 832 mL at 328 degrees celcius and 347 mmHg. What vo

Question

A sample of propane occupies 832 mL at 328 degrees celcius and 347 mmHg. What volume will it occupy at STP? If it takes 80 hours for a radionuclide to decay from 64,000 counts per minutes to 4,000 counts per minute, how long is one half - life of the radionuclide? What is the molarity of a solution made by dissolving 45.0 g of NaOH (molar mass = 40.0 g) in enough water to make 750 mL solution? Determine the empirical formula a molecule has the following elemental analysis: 56.34 % P and 43.66 % O

Explanation / Answer

Ans 1.

Using the ideal gas law , pV = nRT

where p is pressure in atm , V is volume in Litres , n is number of moles , R is universal gas constant and T is temperature in kelvin.

347 mmHg = 0.45658 atm

328 degree celsius = 601 K

putting all the values

0.45658 x 0.832 = n x 0.0821 x 601

n = 0.0077 moles

1 mole of ideal gas occupies 22.4 L volume at STP

so 0.0077 moles will occupy 0.0077 x 22.4 = 0.17248 L

or 172.48 mL

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