Ethylene glycol, the primary ingredient in antifreeze, has the chemical formula C2H6O2. The radiator fluid used in most cars is a half-and-half mixture of water and antifreeze. Part A What is the freezing point of radiator fluid that is 50% antifreeze by mass? Kf for water is 1.86 ∘C/m. Part B What is the boiling point of radiator fluid that is 50% antifreeze by mass? Kb for water is 0.512 ∘C/m.

Thermochemistry

1. How much heat is required to convert 180g of ice at -40C to steam at 120C?

2. Write the thermochemical equation for the decomposition of one mole of methanol, CH3OH(l), into its elements in their stable states at 25C and 1atm.

A solution is prepared by dissolving 23.7 g of CaCl2 in 375 g of water. The density of the resulting solution is The mole fraction of Cl- in this solution is __________ M.

In a given experiment 1.00 mole of N2 and 3.00 moles of H2 were placed in a 3.00 L container. Equilibrium was established given the following reaction: N2(g) + 3H2(g) 2NH3(g) Complete the following table. Use numerical values in the Initial row and values containing the variable "x" in both the Change and Equilibrium rows. Let x = the amount of N2 needed to reach equilibrium.

At equilibrium the concentration of NH₃ is 0.0519 M.

Determine the following quantities at equilibrium. Calculate the concentrations to 2 significant figures:

[N₂] = M
[H₂] = M

Determine the numerical value of K for this reaction.

(Enter your answer to two significant figures.)

K =

3.1. Carefully explain the following observations:

(i) Silver dissolves poorly in copper at 100°C.

(ii) Copper dissolves poorly in silver at 100°C.

(iii) The amount of copper (in atom per cent) that can dissolve in silver at 100°C is greater than the amount of silver (in atom per cent) that can dissolve in copper at 100°C.

For biochemistry, it asks "At what optimal pH can you separate an amino acid mixture of lysine, arginine, and cysteine" and the answer is 9.5

Then it asks for the net charge of arginine at the chosen pH. The answer came out as 0.24, which I have no idea how it got there. My question is how do you do this? This is the info i have:

pKa of COOH = 2.2

pKa of NH3+ = 9.0

pKa of R group = 12.5

A solution is prepared by adding 0.298 mol of a weak monoprotic acid (HA) to a sufficient amount of deionized water to give a total solution volume of 400.0 mL. If the Ka of the weak acid is 3.2 x 10^-5, what is the pH of the solution?

Determine the concentrations of K2SO4, K , and SO42– in a solution prepared by dissolving 2.72 × 10–4 g K2SO4 in 1.00 L of water. Express all three concentrations in molarity. Additionally, express the concentrations of the ionic species in parts per million (ppm). Note: Determine the formal concentration of SO42–. Ignore any reactions with water.

A 425 mg sample of a weak diprotic acid is dissolved in enough water to make 275.0 ml of solution. The pH of this solution is 3.08. A saturated solution of calcium hydroxide (K_sp= 1.3 x 10^-6) is prepared by adding excess calcium hydroxide to water and then removing the undissolved solid by filtration. Enough of the calcium hydroxide solution is added to the solution of the acid to reach the second equivalence point. The pH at the second equivalence is 11.7. The first dissociation constant for the acid is 8.0 x 10^-5. Assume that the volumes of solutions are additive and that the first K for the acid is at least 1000 times greater than the second K.

            a- Calculate the molar mass of the acid

            b- Calculate the second dissociation constant for the acid.

A sample consisting of 2.0 mol CO2 occupies a rigid container (constant volume) of 15.0 L at 300 K. When it is supplied with 2.35 kJ of energy as heat its temperature increases to 341 K. Assume that CO2 is described by the van der Waals equation, and calculate w, U, and H.

Use the VSEPR model of molecular geometry to rationalize the geometries of IF2−, IF3, IF4–, IF5, IF6–, IF7 and the isoelectronic group 18 species XeF2, XeF3+, XeF4, XeF5+, XeF6 and XeF7+ (the latter is presently unknown). Provide perspective drawings of these structures (including the lone pairs and bonding pairs of electrons).

I did a lab and it's asking for the theoretical pH with the addition of HCl. The procedure:measure out 5.0ml of 1.0ml sodium acetate solution in a 100 ml graduated cylinder. dilute the 5.0 ml w/ water to a final volume 50.0 mL&stir.measure out 1.00ml of 1.0 M HCl&add it to the sodium acetate solution.stir the mixture.calculate the theoretical pH.

When atoms are tightly bonded together or not so tightly bonded together, how does this tie with the properties of materials? Such as ductile, elasticity, strength, hardness, etc....

Determine [Zn2 ], [CN–], and [HCN] in a saturated solution of Zn(CN)2 in a buffer with a pH of 1.060. The Ksp for Zn(CN)2 is 3.0 × 10–16. The Ka for HCN is 6.2 × 10–10. Because a buffer is present, you cannot know the charge balance equation.

Why acidic solution such as sulfuric acid is convinient to using for reduing agent

What is the coordination environment of V3+