Please help calculate the volume of sample oxygen and the molar volume at STP of

Question

Please help calculate the volume of sample oxygen and the molar volume at STP of O2 (I think I did a and b correctly but I cannot get c or d).

3. Potassium perchlorate, KCIO, decomposes on heating to form potassium chloride and elemental oxygen. a. Write a balanced molecular equation for the thermal decomposition of potassium perchlorate. K CId4 KCl + 20, Using a setup like this experiment, the following data were collected: Mm 04 02 - 32 g/wa MM Clay • 138.55 mass of sample before heating 1.2460 g mass of residue after heating 0.9265 g volume of water displaced 258 mL atmospheric pressure 748.9 torr water temperature 26.0°C b. What is the percent mass KCIO, in the sample being heated? 1. 24 60%“.0265 = 3 1955 320 = .00 99 8438 ) X : 00 498 438 mo) = -0499 2a .004 GG210x 136 55: , .691 600 156 100: 55.51% .091oo758 1.2460 What volume would this sample of oxygen occupy if collected at standard temperature and pressure? d. What is the molar volume at STP of O, according to these data?

Explanation / Answer

KClO4 ----> KCl + 2O2

c]

PV = nRT

Standard Temperature = 273 K and pressure = 1 atm

n = 0.009984375

R = 0.0821

1*V = 0.009984375*0.0821*273

V = 0.22378 L = 223.78 ml

It occupies ---> 223.78 ml at STP

d]

molar volume means ---> 1 mole occuipes how much volume at given conditions

STP

T = 273 K

P = 1 atm

n = 1

R = 0.0821

PV = nRT

1*V = 1*0.0821*273

V = 22.4 Litres

It occupies 22.4 L of volume at STP

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