Chemistry Answers

What volume of 0.100 M K2S solution contains 3.5 g of the solute?

1.Predict whether ΔS is positive or negative for the reaction: N2(g) + O2(g) ⟶ 2NO(g)

2.Which has greater entropy? 1mole of NaCl(s) or 1 mol of HCl(g)

Question 4

(a) You are developing a new colorimetric procedure for determining the glucose content of blood serum. You have chosen the standard Folin-Wu procedure with which to compare your results. From the following two sets of replicate analyses on the same sample, determine whether the variance of your method differs significantly from that of the standard method.

Your Method (mg/L): 127, 125, 123,130,131,126 and 129

Folin-Wu method (mg/L): 130, 128, 131, 129, 127,125

What are lactams? Write the structures of gama -butyrolactam and delta -valerobacteria and give their IUPAC names.

How would you prepare the following? (i) Ethanoid anhydride using ketene (ii) A tertiary alcohol starting from an ester`

An expandable container of oxygen gas has a volume of 12.5mL at a temperature of 26.0°C. What volume will the gas occupy at 54.0°C?

If 1.25 g of sodium carbonate was dissolved in water and the solution titrated with 22.7 ml of hydrochloric acid to a medal orange end point, calculate (i) the molarity and (ii) the percent by mass (density of sution = 1.02 g/ml) of the hydrochloric acid solution

Calculate the molar concentration of each of the following:

a. 6.0 N sulfuric acid (in reactions that replace both hydrogens)

b. 3.5 N potassium hydroxide

c. 4.0 N phosphoric acid (in reactions that replace two hydrogen ions)

d. 6.2 N sodium hydroxide

1. Consider a buffer solution containing an acid with a pKa of 2.3 and an acid concentration that is one-fourth the concentration of the conjugate base. What is the pH of the solution?

2. Calculate the pH of a buffer containing 0.1 M sodium acetate and 0.2 M acetic acid (pKa= 4.76).

3. The pH of the given solution of lactic acid and lactate is 4.30. Calculate the pKa of lactic acid, when the concentration of lactic acid and lactate are 0.020 M and 0.073 M respectively.

it requires 2 sticks of butter to make a batch of 20 cookies. How much butter will it take to make 150 cookies.