Question

31.47 mL of hydrogen gas was collected over water, at 200C and 774-mmHg atmospheric pressure, when...

31.47 mL of hydrogen gas was collected over water, at 200C and 774-mmHg atmospheric pressure, when 0.0321 g of magnesium was reacted according to the following equation:

            Mg (s)  +  2 HCl (aq)     MgCl2(aq)  +  H2(g)

The pressure of water vapor at 20 0C is 18 mmHg.

  1. Calculate the Gas constant based on the experimental results above. Show all your work. Furthermore, why is gas collected over water not pure?
Science   Chemistry   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

The gas colleted over water is not pure as during the reaction water also gets evaporated due to the heat produced and get mixed with the gas above in form of vapours .

Please like the answer if you find it helpful . I did the best I could.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A piece of solid magnesium is reacted with dilute hydrochloric acid to form hydrogen gas: Mg(s)...
A piece of solid magnesium is reacted with dilute hydrochloric acid to form hydrogen gas: Mg(s) + 2 HCl(aq) Æ MgCl2(aq) + H2(g) What volume of H2 is collected over water at 28 °C by reaction of 1.25 g of Mg with 50.0 mL of 0.10 M HCl? The barometer records an atmospheric pressure of 748 torr and the vapor pressure of water at this temperature is 28.35 torr. I am not quite sure what to do with the vapor...
Hydrogen produced from a hydrolysis reaction was collected over water. The data is compiled in the...
Hydrogen produced from a hydrolysis reaction was collected over water. The data is compiled in the table. Total volume of H2(g) collected = 95.42 mL Temperature = 23.0 °C Barometric pressure = 742 mmHg Vapor pressure of water at 23.0 °? = 21.0 mmHg Calculate the moles of hydrogen gas produced by the reaction.
A 300–mL volume of hydrogen is collected over water at 22 °C under a barometric pressure...
A 300–mL volume of hydrogen is collected over water at 22 °C under a barometric pressure of 740 mmHg. What is the volume of this hydrogen, at the same temperature and barometric pressure, when dry? (vapor pressure of water at 22 °C = 20 mmHg) the answer is 292 mL. PLEASE EXPLAIN HOW YOU GET THIS ANSWER :(
When excess nitric acid reacts with 1.68 g of iron, 842 mL of hydrogen gas is...
When excess nitric acid reacts with 1.68 g of iron, 842 mL of hydrogen gas is collected over water. If the barometric pressure is 833 mmHg and the temperature of the water is 34°C, what is the calculated value of R, in atmL/molK? (Water vapor pressure at 34°C = 39.90 mmHg) __Fe(s) + __HNO3(aq) → __Fe(NO3)2 + __H2(g)
A sample of hydrogen is collected by displacing 175 mL of water. The atmospheric pressure is...
A sample of hydrogen is collected by displacing 175 mL of water. The atmospheric pressure is 725 mm Hg. The temperature of the water is 25.5 degrees Celsius and that of the gas is 312 Kelvin. How many moles of hydrogen have been evolved?
If 68.0 cm3 of hydrogen gas is collected over water at 45C and 765 MmHg, what...
If 68.0 cm3 of hydrogen gas is collected over water at 45C and 765 MmHg, what is the volume of dry gas at standard conditions? The vapor of water is 72 mm Hg at 45C.
Hydrogen gas can be produced in the laboratory through the reaction of magnesium metal with hydrochloric...
Hydrogen gas can be produced in the laboratory through the reaction of magnesium metal with hydrochloric acid: Mg(s)+2HCl(aq)→MgCl2(aq)+H2(g) What is the volume, in liters, of H2 gas produced at 27 ∘C and 820 mmHg from the reaction of 30.0 g of Mg?
Mg metal reacts with HCl to produce hydrogen gas. Mg(s)+2HCl(aq)→MgCl2(aq)+H2(g) What volume of hydrogen at 0...
Mg metal reacts with HCl to produce hydrogen gas. Mg(s)+2HCl(aq)→MgCl2(aq)+H2(g) What volume of hydrogen at 0 ∘C and 1.00 atm (STP) is released when 8.80 g of Mg reacts? Express your answer with the appropriate units. How many grams of magnesium are needed to prepare 5.75 L of H2 at 745 mmHg and 16 ∘C? Express your answer with the appropriate units.
The hydrogen gas formed in a chemical reaction is collected over water at 30.0 ∘C at...
The hydrogen gas formed in a chemical reaction is collected over water at 30.0 ∘C at a total pressure of 736 mmHg Part A What is the partial pressure of the hydrogen gas collected in this way? Part B If the total volume of gas collected is 722 mL , what mass of hydrogen gas is collected?
When 0.854 g of impure zinc reacted with an excess of hydrochloric acid, 244 mL of...
When 0.854 g of impure zinc reacted with an excess of hydrochloric acid, 244 mL of hydrogen gas was collected over water at 10.0 °C. The external pressure was 714.96 Torr. The vapor pressure of water at various temperatures can be found in this table. a. Calculate the volume the dry hydrogen would occupy at 1.00 atm and 298 K. b. What amount, in moles, of H2 gas was collected at 10.0 °C? c.Calculate the percentage purity of the zinc...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT