A common way to make hydrogen gas in the laboratory is to place a metal such as zinc in hydrochloric acid (see the figure). The hydrochloric acid reacts with the metal to produce hydrogen gas, which is then collected over water. Suppose a student carries out this reaction and collects a total of 147.6 mL of gas at a pressure of 743 mmHg and a temperature of 25° C. What mass of hydrogen gas (in mg) does the student collect? (The vapor pressure of water is 23.78 mmHg at 25° C.) Collecting a Gas over Water -Н2 Hydrogen plus water vapor - Zn -HCl -Н-0 Express the mass to three significant figures and include the appropriate units. HA Value Units т 3

Question
A common way to make hydrogen gas in the laboratory is to place a metal such as zinc in hydrochloric acid (see the figure). The hydrochloric acid reacts with the metal to produce hydrogen gas, which is then collected over water.
Suppose a student carries out this reaction and collects a total of 147.6 mL of gas at a pressure of 743 mmHg and a temperature of 25° C. What mass of hydrogen gas (in mg) does the student collect? (The vapor pressure of water
is 23.78 mmHg at 25° C.)
Collecting a Gas over Water
-Н2
Hydrogen plus
water vapor
- Zn
-HCl
-Н-0
Express the mass to three significant figures and include the appropriate units.
HA
Value
Units
т 3
Expand
Transcribed Image Text

A common way to make hydrogen gas in the laboratory is to place a metal such as zinc in hydrochloric acid (see the figure). The hydrochloric acid reacts with the metal to produce hydrogen gas, which is then collected over water. Suppose a student carries out this reaction and collects a total of 147.6 mL of gas at a pressure of 743 mmHg and a temperature of 25° C. What mass of hydrogen gas (in mg) does the student collect? (The vapor pressure of water is 23.78 mmHg at 25° C.) Collecting a Gas over Water -Н2 Hydrogen plus water vapor - Zn -HCl -Н-0 Express the mass to three significant figures and include the appropriate units. HA Value Units т 3

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