Other Chemistry Answers

2. The Tl in a 9.76-g sample of rodenticide was oxidized to the trivalent state and treated with an unmeasured excess of Mg/EDTA solution. The reaction is Tl3+ + MgY2- → TlY- + Mg2+

.Titration of the liberated Mg2+ required 13.34 mL of 0.03560 M EDTA. Calculate the % of Tl2SO4 (504.8 g/mol) in the sample.

What does acid do to protons

Consider the following half-reactions and their standard reduction potential values to answer the following questions.


Cu2+ (aq) + e- Cu+ (aq) E° = 0.15 V

Br2 (l) + 2e- 2Br- (aq) E° = 1.08 V


i) State which reaction occurs at the anode and which at the cathode. [2 marks]

ii) Write the overall cell reaction. [2 marks]

iii) Calculate the value of E°cell. [2 marks]

iv) Calculate the value ΔG° [2 marks]

v) What is the value of Kc at 25°C? [2 marks]

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What is the half-life of a first-order reaction with a rate constant of 4.30×10−4 s−1?

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What is the rate constant of a first-order reaction that takes 234 seconds for the reactant concentration to drop to half of its initial value?

A 2.75 L sample of helium gas at 99.0 kPa was heated from 21.0°C to 71.0°C and the pressure changed to 100.0 kPa. Calculate the final volume.

A bicycle tire has a pressure of 450. kPa at 20.0°C. Assuming the volume does not change, what is the new pressure at 35.0°C?

A 400. mL sample of a gas at 10.0°C is warmed to 25.0°C at a constant pressure. Calculate the final volume

What is the pressure required to compress hydrogen at 1.00 atm from 300.0 mL to 200.0 mL at a constant temperature?

A gas in a closed container exerts a pressure of 55p.s.i. Determine the pressure in torr