Chemistry Answers

what type of elements form positive ions

Write the balanced redox equation for: I^- + OCl^- ---> I₂ + Cl₂

Write the balanced redox equation for: NO + Cu²⁺ ---> NO₃^- + Cu 

Cobalt-60 is used extensively in medicine as source of Y-rays .

What is the half life of Co-60 it's takes 13.0 years to decrease the original activity to 18.0%?

How many mL of 0.25M solution of H2SO4 will react with 10mL of 0.25M solution of NaOH?

Determine the pH of a 0.020 M HNO₃ 

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Postlets in State Molecular Theory of Gus and Alsace.

Determine the composition of a methanol-ethanol mixture over which the equilibrium vapour pressure is 5.0 kPa. Assume that the mixture is ideal.

(Vapour pressure of pure methanol is 8.9 kPa; vapour pressure of pure ethanol is 4.0 kPa)

Report your answer in terms of mole fraction of methanol as a decimal to 3 significant figures. Do NOT include any words, symbols, units or spaces in your answer.

Use the information provided in question 7 to answer the question below.

What is the vapour composition above the mixture of methanol and ethanol?  

Report your answer in terms of mole fraction of methanol as a decimal to 3 significant figures. Do NOT include any words, symbols, units or spaces in your answer.

7.Determine the composition of a methanol-ethanol mixture over which the equilibrium vapour pressure is 5.0 kPa. Assume that the mixture is ideal.

(Vapour pressure of pure methanol is 8.9 kPa; vapour pressure of pure ethanol is 4.0 kPa)

Report your answer in terms of mole fraction of methanol as a decimal to 3 significant figures. Do NOT include any words, symbols, units or spaces in your answer.

8.Use the information provided in question 7 to answer the question below.

Which statement is true about the composition of the vapour above an equimolar mixture of methanol and ethanol?

a.the vapour component that is in larger proportion depends on temperature

b.the vapour contains more ethanol than methanol

c.the vapour contains more methanol than ethanol

d.the vapour has equal amounts of methanol and ethanol