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Please answer Questions 3 & 4 with the info given on the first page.

Muscles may ache after strenuous exercise because lactic acid formed faster than it is metabolized to CO2 and H2O. What is the pH of the fluid in muscle when the lactic acid concentration reaches 1.0*10^-3 mol/L. Ka(lactic acid)=8.4*10^-4

(Answer is 3.23)

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Nootkatone one of the chemicals responsible for the odour and taste of grape fruit, shows a molecular ion a M/E= 218 in its mass spectrum and contains carbons, hydrogen, and oxygen.

Suggest several possible molecular formular for nootkatone. How many degrees of unsaturated (double bonds & rings) are indicated.

Calculate the standard enthalpy change of reaction (ΔH°) for the following reaction using the reaction enthalpies and the standard enthalpies of formation (ΔHf°) of the reactants and products:

2SO2(g) + O2(g) -> 2SO3(g)

Given: ΔHf° (SO2) = -296.8 kJ/mol ΔHf° (O2) = 0 kJ/mol ΔHf° (SO3) = -395.6 kJ/mol

Note: All enthalpy changes are given per mole of substance.

Calculate the number of moles of solute present in 500 mL of a 0.75 M solution of magnesium chloride (MgCl2).

1. You are given the number of moles of carbon and must convert it to an equivalent mass using the molar mass from the periodic table. The carbon sample is 0.045 moles.

2.  How many moles of potassium are in 525.0 g of pure potassium? Explain

Calculate the pH of a buffer solution made dissolving 0.150 moles of sodium dihydrogen phosphate (Na2P04) and 0.100 moles of sodium hydrogen phosphate (Na2HP04)

in enough water to make 0.500 L of solution. Ka = 6.3 x10-8

Use the figure below to determine how the pressure of a gas (at constant volume) is related to the temperature

3) Convert 5.50 g of Na2CO3 to mol.

What is the difference between steam and boiling water?

1) Find the moles of each element in 1.25 mol of Na2CO3.

2) Convert 2.50 mol of Na2CO3 to mass in g.

3) Convert 5.50 g of Na2CO3 to mol.

4) Covert 5.50 g of Na2CO3 to number of particles.

4) Convert 5.50 g of Na2CO3 to number of particles.

1. Why does ninhydrin stain the skin blue? a. Skin contains amino acids. b. Ninhydrin is blue-colored. c. Ninhydrin turns blue when warmed. Explain your answer: