Name: Lab day/time: Expt 8 Prelab Assignment DUE: Week 9 at the beginning of the

Question

Name: Lab day/time: Expt 8 Prelab Assignment DUE: Week 9 at the beginning of the lab period! Reading Assignment: Lab Packet Expt 8 The Ideal Gas Law . Chemistry Textbook, Sections 5.2-5.6 Gases and the gas laws Chemistry Textbook, Sections 3.7 (chemical equations) and 3.8 (limiting reagents) .Laboratory handbook, Table 5, p. 109 Vapor pressure and temperature data Write the balanced chemical equation for the reaction between the nitrite ion and sulfamic acid. 8a 8b Based on the reaction above, how many moles of nitrogen gas (N2) will be produced from the complete reaction of 0.10 g of sodium nitrite? 8c What would be the volume of this nitrogen gas, assuming it was generated at room temperature (25 ) and 1.0 atm pressure? 8d What is the vapor pressure of water at 25 C? Indicate how you got your answer. For a gas that has a pressure of 725 torr, convert it to units of atmospheres and mmHg. Show your work Be

Explanation / Answer

8a)

No2- + H3NSO3 -------> HSO4- + N2 + H2O

8b)

1 mole of NaNO2 produces 1/2 mole of N2 gas ( one N form NO2- and another from Sulfamic acid)

0.1/69 moles of NaNO2 produces 1/2*0.1/69 moles of N2 gas

                             = 7.2463 * 10^-4 moles of N2
8c)

PV = nRT

1 * V = 7.2463 * 10^-4 * 0.0821 * (25+273)

V = 0.01773 L

8e)

1 torr = 1mmHg

725 torr = 725 mmHg

1 atm = 760 mmHg

725 mmHg = 725 * 1/760 atm = 0.9539 atm

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