Chemistry Answers

What type of reagent is required to convert NO2- to HNO2?

Which of the following ions has the highest ion mobility in aqueous solution at 298 K?

(a) OH-

(b) Mg2+

(c) H+

(d) SO42-

What is the potential for the electrochemical cell if the activity of H+ in the anodic half-cell is 0.100, the fugacity of H2 in the anodic half-cell is 0.500, and the activity of Cu2+ in the cathodic half-cell is 0.0500? Fugacity is the equivalent term for the activity of a gas.

What is the activity of Ag+ in an electrochemical cell if the activity Zn2+ is 0.0167 and Ecell is +1.50 V?

Which of the following ions has the highest ion mobility in aqueous solution at 298 K?

Write a brief statement of a real world application of single replacement reactions

Calculate the mass of CO₂ in 2.0L soft drink after the bottle is opened and equilibrates at 25°C under a CO₂ partial pressure of 3.0×10^-4 atm.The Henry's law constant for CO₂ at this pressure is 3.4×10^-2 mmolL.atm

Calculate the total amount of energy (in kJ) necessary to raise the temperature of 2.00 L of ethanol (density = 0.7849 g/cm3 ) from 18 0C to its boiling point (78.3 0C) and then to fully vaporize the liquid. Assume that it is a closed system where no heat exchange with the surroundings take place. (Given: Cethanol = 2.44 J/g·K; heat of vaporization of ethanol at 78.3 0C = 38.56 kJ/mol.)

balance (𝐾+HO–)(𝑎𝑞) + (CO2+ 2𝑁𝑂−) → 𝐾+CO 2/3–

+ H2O 

1. What is the molarity of a solution that contains 0.5 moles of HCl in 200ml of water? 
2. What is the molarity of a solution that has 5g of H2SO4 in 150ml of water?
3. 15g of Sodium Chloride in 1.5L of water?
4. 22g of magnesium chloride in 750ml of water?
5. 2.7x 10-4g of sodium chloride in 15mL of water?

pH problems

1. What is the pH of a 0.2M HCl solution?
2. Find the pH of a 0.0015M solution of nitric acid.
3. 0.0025M sodium hydroxide solution
4. Find the pH when 5g of HCl is dissolved in 150ml of water
5. Find the pH when 4g of NaOH is added to 500ml of water