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The zinc within a copper-plated penny will dissolve in hydrochloricacid if the copper coating is filed down in several spots (so thatthe hydrochloric acid can get to the zinc). The reaction betweenthe acid and the zinc is:
Zn (s) + 2 HCl (aq) ZnCl2 (aq) + H2 (g)
When the zinc in a certain penny dissolves, the total volume of gascollected over water at 25.0

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Tod ThielLv2
28 Sep 2019
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Related questions

Small quantities of hydrogen gas can be prepared in the lab by addition of hydrochloric acid to zinc. The gas is typically collected over water (what does collected over water mean?). What volume of hydrogen can be collected from 0.625g Zn? The total pressure is 784torr at 30oC. Water has a vapor pressure of 32torr at 30oC.

Zn(s) + 2 HCl(aq) --> ZnCl2(aq) + H2)g)

a) 30mL b) 157mL c) 240mL d) 316mL e) 564mL

4. Hydrogen gas is collected over water at 22.0รขย„ยƒ by reacting zinc with hydrochloric acid according to the following equation. Zn(s) + HCl(aq) รขย†ย’ ZnCl2(aq) + H2(g) The total gas pressure is 756.9 torr. The vapor pressure of water at this temperature is 19.8 torr. Solve for the pressure, in units of kPa, of the pure hydrogen gas.

5. _____ All of the following are postulates of the Kinetic Molecular Theory except: ( which letter is the correct answer)

a. Gas molecules are small compared to the volume of the container, their volume is considered negligible.

b. Gas molecules do not have attractive or repulsive forces toward one another.

c. Gas molecules are in constant, straight line motion, and do not change direction until colliding with something.

3. A steel tank with a volume of 75.0 L contains 0.106 moles of He(g). Solve for the pressure this gas exerts, in atm, at a temperature of 15.0 deg. Celsius.

4. Hydrogen gas is collected over water at 22.0รขย„ยƒ by reacting zinc with hydrochloric acid according to the following equation. Zn(s) + HCl(aq) รขย†ย’ ZnCl2(aq) + H2(g) The total gas pressure is 756.9 torr. The vapor pressure of water at this temperature is 19.8 torr. Solve for the pressure, in units of kPa, of the pure hydrogen gas.

5. _____ All of the following are postulates of the Kinetic Molecular Theory except:

a. Gas molecules are small compared to the volume of the container, their volume is considered negligible.

b. Gas molecules do not have attractive or repulsive forces toward one another.

c. Gas molecules are in constant, straight line motion, and do not change direction until colliding with something.

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