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# Joy

Questions7
• ### AP Chem Help?

The decomposition of sulfuryl chloride (SO2Cl2) is a first-order process. The rate constant for the decomposition at 660 K is 4.5×10^−2 s−1.

At what time will the partial pressure of  SO2Cl2 decline to one-tenth its initial value?

• ### AP Chemistry help needed...?

Doing a chemistry problem but I need some help on it, it goes...

Elemental calcium is produced by the electrolysis of molten CaCl2.

Part A:

What mass of calcium can be produced by this process if a current of 5700A

is applied for 42h? Assume that the electrolytic cell is 55% efficient.

For part A, I got 9.8×10^4 g which is correct.  I am having trouble with Part B.

Part B:

What is the minimum voltage needed to cause the electrolysis?  (V)

.

Chemistry5 months ago
• ### How many moles of HF (Ka=6.8×10^−4) must be added to water to form 0.180L of solution with a pH  of 2.60? ?

I am stuck on this AP chemistry problem.  I tried it myself and got .00167 mol of HF but it said it was wrong.  If someone could please help me out.

• ### Chemistry Problem?

Hello, I'm stuck on a AP chemistry problem, here it is.

What is the pH of a solution that is 1.6×10^−9 M in NaOH?

• ### What is my skin undertone? ?

I heard you can tell by veins, so I included one

2 AnswersOther - Skin & Body7 months ago
• ### Need help finding magnitude of K.?

A particular first-order reaction has a rate constant of 1.35x10^2s−1 at 25.0∘C . What is the magnitude of k at 41.0∘ C  if  Ea = 55.5 kJ/mol .

Options:

1.23×10^4

1.35×10^2

154

2.60×10^47

4.23×10^2

K2SO4

Zn(NO3)2

(NH4)2SO4

Mg(MnO4)2

NaCl

• ### Which produces the greatest number of ions when one mole dissolves in water? ?

Stuck on this chemistry question on my homework, the options are:

CO2

KBr

NH4F

K2CO3

NaMnO4

• ### Calculate the molarity of phosphoric acid (H3PO4) in a 34.7% (by mass) aqueous solution. ?

Hello, I need some help with this question on my homework, the options are:

4.45×10−2 m

8.90×10−2 m

0.178 m

9.77×10−2 m

The density of the solution is needed to solve the problem.

• ### Can someone explain this AP Chem level morality question?

The question asks to Indicate the concentration of each ion present in the solution formed by mixing and is setup with 44.0mL of 0.150M Na2SO4 and 25.0 mL of 0.200M KCl.  It then asks what the Moralities of MNa+, MSO42−, MK+,  MCl− are with the correct answer being 0.191, 9.57×10^−2, 7.25×10^−2, 7.25×10^−2, or course in order of how they are asked.  I tried 6 different ways but am still stuck on how those are the correct answers, can someone please explains.  Thanks!

• ### Indicate the concentration of each ion present in the solution formed by mixing?

44.0mL of 0.150M Na2SO4 and 25.0mL of 0.200M KCl. Enter your answers numerically separated by commas

MNa+,  MSO42− ,  MK, MCl − =

Chemistry9 months ago
• ### What are the phases for the equation below?

The equation is Mg(OH)2  +  2 HNO3   --->   Mg(NO3)2   +   2 H2O but it also asks for the phases, but I do not know if some are liquid, aqueous, or solid.  Thanks!

• ### If 0.3315g of BARIUM SULFATE was obtained, what was the mass percentage of barium in the sample? ?

A 3.915g sample of a mixture was analyzed for barium ion by adding a small excess of sulfuric acid to an aqueous solution of the sample. The resultant reaction produced a precipitate of barium sulfate, which was collected by filtration, washed, dried, and weighed.