Part A

It takes 47.0 J to raise the temperature of an 9.50 g piece of unknown metal from 13.0∘C to 24.8 ∘C. What is the specific heat for the metal?

Express your answer with the appropriate units. Cs=

Parts B and C

The next two questions pertain to silver. They have nothing to do with unknown metal described in Part A.

Part B

The molar heat capacity of silver is 25.35 J/mol⋅∘C. How much energy would it take to raise the temperature of 9.50 g of silver by 19.5 ∘C?

Express your answer with the appropriate units. q=

Part C

What is the specific heat of silver?

Express your answer with the appropriate units.

You want to determine the percent of sulfate in an unknown sample of a hydrated metal sulfate with the formula My(SO4)x·nH2O. You dissolve 0.2888 g of your unknown in DI water and heat to near boiling. You react the dissolved unknown with a hot barium chloride solution and you collect the barium sulfate you make via gravity filtration. The filter paper weighed 0.597 g after a piece was torn off. The dry barium sulfate crystal and the filter paper weighed 0.910 g. Answer the following:

1. What is the molar mass of barium sulfate?

2. What is the molar mass of sulfate?

3. How many moles of sulfate were produced?

4. How many grams of sulfate were produced?

5. What is the percent sulfate?

I know the answer for the first two but im unsure of the next couple of questions. Thank you in advnadce :)

write a detailed mechanism for a) the hydrolysis of methyl salicylate in basic solution b) the acetylation of salicylic acid in acidic solution and c) the acetylation of vanillin in basic solution.

Calculate the pH of a solution made by adding 54 g of sodium acetate, NaCH3COO, to 12 g of acetic acid, CH3COOH, and dissolving in water to make 400. mL of solution.

A buffer that contains 0.592 M base, B, and 0.286 M of its conjugate acid, BH+, has a pH of 8.87. What is the pH after 0.0020 mol of HCl is added to 0.250 L of the solution?

1.)Describe the effect of increasing the concentration of the reactants on the rate of a reaction.

2.)The exponents in a rate law have no relationship to the coefficients in the overall balanced equation for the reaction. Give an example of a balanced equation and the rate law for a reaction that clearly demonstrates this.

3.)Compare the half-life equations for a first-order and a second-order reaction. For which reaction order is the value of the half-life independent of the reactant concentration??

The two pK_as of sulfurous acid (H₂SO₃) are 1.81 and 6.91, respectively. The predominant species at pH = 9 is: (Question from "Cracking the MCAT, 2010-2011 edition" by The Princeton Review)

Phosphine (PH₃) decomposes into phosphorus and molecular hydrogen:
4PH₃(g) → P₄(g) + 6H₂(g)
Experiments show that this is a first-order reaction, with a rate constant of 0.0173 s^-1 at 650°C. Identify each of the following statements about this reaction as true or false. (Use the drop-down menu and select "True" or "False" for each. You must get all 4 correct.)
True/False  The mechanism for this reaction must involve two or more elementary steps.
True/False  The activation energy for the reaction cannot be determined without additional data.
True/False  The rate constant would be smaller than 0.0173 s^-1 at 500°C.
True/False  The rate-determining step for the reaction could involve a bimolecular collision between two PH₃ molecules.

Chemical Engineering Problem:

A vapor composed of 0.25 mole fraction ethanol and 0.75 mole fraction acetic acid at 120.0 mmHg (absolute), is in equilibrium with a liquid phase also composed of ethanol and acetic acid. Assume that the liquid is an ideal solution and apply Raoult\'s law to find the following. What is the temperature of the liquid?

What is the Temperature of the fluid? _____C

What are the mole fractions of the liquid phase?

X_E=_____mol ethanol/mol

X_A=_____mol acetic acid/mol

4 liter sealed container contains water vapour at 0.4 atm and 90°C. a) What is the dew point of the vapour? b) Determine the percentage of the vapour that will condense if the system is cooled to 50°C.

Part A

Determine the [H3O+] of a 0.250M solution of formic acid.

Express your answer using two significant figures.

[H3O+] = ???

Part B

Determine pH of this solution of formic acid.

Express your answer to two decimal places.

pH=???

500.0 mL of 0.140 M NaOH is added to 595 mL of 0.200 M weak acid (Ka = 2.29 × 10-5). What is the pH of the resulting buffer? HA (aq) + OH (aq) ---> H2O (L) + A (aq)

What compound is used as a standard for location of NMR signals?

Select one:

a. acetone, CH₃COCH₃

b. silicon grease

c. water

d. deuterated water, D₂O

e. deuterated chloroform, CDCl₃

f. trimethylsilane, (CH₃)₄Si

g. chloroform, CHCl₃

Menthol is a crystalline substance with a peppermint taste and odor. When 1.22 g of menthol is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 6.52 °C. The freezing point and Kf constant for cyclohexane can be found here. Calculate the molar mass of menthol.