Work Tor Tull Credit CHAPTER 5 PROBLEM 1 Calculate the volume in liters occupied

Question

Work Tor Tull Credit CHAPTER 5 PROBLEM 1 Calculate the volume in liters occupied by 7.40 g of NH3 at STP. PROBLEM 2 An inflated helium balloon with a volume of 0.55 Lat sea level (1.0 atm) is allowed to rise to a height of 6.5 km, where the pressure is about 0.40 atm. Assuming that the temperature remains constant, what is the final volume of the balloon? PROBLEM 3 Argon is an inert gas used in lightbulbs to retard the vaporization of the tungsten filament. A certain lightbulb containing argon at 1.20 atm and 18 oC is heated to 85 °C at a constant volume. Calculate its final pressure (in atm). PROBLEM 4 The temperature of 2.5Lof a gas initially at STP is raised to 250 oC at constant volume. Calculate the final pressure of the gas in atm. PROBLEM 5 A gas evolved during the fermentation of glucose (wine making) has a volume of 0.78 L at 20.1 °C and 1.00 atm. What was the volume of this gas at the fermentation temperature of 36.5 °C and 1.00 atm pressure? PROBLEM 6 A sample of diborane gas (B2H6), a substance that bursts into flame when exposed to air, has a pressure of 345 torr at a temperature of -15 oCand a volume of 3.48 L. If conditions are changed so that the temperature is 36 °C and the pressure is 468 torr, what will be the volume of the sample? CHAPTER 6 PROBLEM 1 A 465 g chunk of iron is removed from an oven and plunged into 375 g water in an insulated container. The temperature of the water increases from 26 to 87 oC. If the specific heat of iron is 0.449 Jg 1 oc-1, what must have been the original temperature of the iron?

Explanation / Answer

Problem 1:

we know that, 1 mole of any gas at STP ( standard temperature and pressure ) occupies volume = 22.4L.

Moles of NH3 present = mass/molar mass = 7.4g/17g/mol = 0.435moles.

So, 0.435 moles of NH3 occupies volume = 22.4L x 0.435 moles/ 1mole = 9.75L

Have a nice day! :)

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