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CH 124 - 002 General Chemistry (Web-Enhanced) Spring 2025 L.Liban

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How many grams of helium are contained in a 2.00 L balloon at 30.0oC and at 735 mmHg? 760 mmHg = 1 atm

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For the reaction 2H2(g) + S2(g) 2H2S(g), determine the equilibrium constant at 7000C if at this temperature, the equilibrium concentrations are as follows:

[H2] = 0.208 M, [S2] = 1.13 x10-6 M , [H2S] = 0.725 M

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Calculate the concentration (% m/V) of NaCl solution that was made by dissolving 15.0g of sodium chloride in enough water to make 300.0 mL of solution.

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Write the equilibrium

constant expression, Keq, for the following reaction?

2NO(g) + O

2(g) 2NO2(g)
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The isotope iodine-131 is used in studies of the

_________________.

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How many grams of lithium chloride (LiCl) are in 500.0 mL of a solution which is 11.75% (m/V)?

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A 4.40-g piece of solid CO2 (dry ice) is allowed to sublime in a balloon. The final volume of the balloon is 1.00 L at 300. K. What is the pressure of the gas?

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A solution contains 1.65 g of NaF in a total volume of 150.0 mL. What is its concentration expressed as % (m/V)?

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Calculate the density of nitrogen gas (N2

)

at STP, in g/L. [Use molar mass: N

2, 28.0 g/mol]

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If the hydrogen ion concentration of an aqueous

solution is 5.0 x 10

-6 M

,

what is the hydroxide ion concentration?

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