胡雪8°

[匿名]

回覆: 1

2019-03-25 10:32 pm

Calculate the solubility of Mn(OH)2 in grams per liter when buffered at pH = 11.6.?

[匿名]

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2019-03-23 11:29 am

0.25L of a 0.110 M of KOH solution will contain how many grams of the solid KOH?

[匿名]

回覆: 1

2019-03-22 8:27 am

Calculate the hydronium ion concentration in an aqueous solution of 9.19×10-2 M ascorbic acid, H2C6H6O6 (aq). [H3O+] = ?

[匿名]

回覆: 1

2019-03-22 9:45 am

which type of substance yields hydrogen ions H+ in an aqueous solution?

[匿名]

回覆: 1

2019-03-22 8:29 am

The standard enthalpy change for following reaction is 186 kJ at 298K. CaH2s ->Cas + H2g What is the standard heat of formation of CaH2(s)?

[匿名]

回覆: 1

2019-03-22 8:30 am

The standard enthalpy change for the following reaction is 511 kJ at 298 K. SnCl4(l) --> Sn(s, white) + 2 Cl2(g) What is the standard heat o?

[匿名]

回覆: 8

2019-03-22 8:55 am

cual es el valor de x y y en la siguiente ecuacion: 2x+7y=5 3x+14y=3?

[匿名]

回覆: 1

2019-03-20 11:48 pm

Write the balanced molecular equation, including physical states, for the reaction of each oxide with water?

[匿名]

回覆: 2

2019-03-20 4:13 pm

Length of the curve calculus?

[匿名]

回覆: 2

2019-03-20 3:14 pm

Help with this math problem!?

[匿名]

回覆: 1

2019-03-20 2:10 pm

For a reaction at 25 ˚C, ∆G˚ = –33.3 kJ and ∆S˚ = –198 J·K–1 . What is the value of ∆H˚?

[匿名]

回覆: 5

2019-03-20 12:00 pm

Need geometry help?

[匿名]

回覆: 1

2019-03-20 11:26 am

Calculate the pH of a 7.2x10^-3 -M solution?

[匿名]

回覆: 1

2019-03-20 10:54 am

19.6 mL solution of 0.100 M HCl is titrated using 0.150 M  NaOH. What is the pH of the solution after adding 2.51 mL of the NaOH solution?

[匿名]

回覆: 1

2019-03-20 10:41 am

A 1.0 L buffer containing 0.118 mol L-1 HOCl and 0.103 mol L-1 OCl-. What is the pH of the solution after adding 7.7 x 10-3 mol of HCl?

[匿名]

回覆: 4

2019-03-20 9:57 am

Let f(x) = (x − 3)^−2. Find all values of c in (2, 5) such that f(5) − f(2) = f '(c)(5 − 2).?

[匿名]

回覆: 2

2019-03-20 9:20 am

Write the structure of the product obtained by reacting propene with water in the presence of a strong acid catalyst.?

[匿名]

回覆: 2

2019-03-20 9:06 am

Maths Help?

[匿名]

回覆: 3

2019-03-20 8:37 am

what is the frequency in hertz of a photon of light with an energy of 5.94 x 10-21j?

[匿名]

回覆: 1

2019-03-20 8:19 am

Chem Question Please Help?

[匿名]

回覆: 4

2019-03-20 1:08 am

How long until the coin will hit the ground?

[匿名]

回覆: 1

2019-03-20 12:07 am

Using standard heats of formation, calculate the standard enthalpy change for the following reaction. 2H2(g) + O2(g)2H2O(g) ANSWER: __ kJ?

[匿名]

回覆: 2

2019-03-20 12:03 am

The salt cesium perchlorate dissolves in water according to the reaction: CsClO4(s) Cs+(aq) + ClO4-(aq) (a) Calculate the standard enthalpy?

[匿名]

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2019-03-19 11:53 pm

Help with buffering?

[匿名]

回覆: 2

2019-03-19 10:37 pm

Why is HSO3- acting as base in both the equations?

[匿名]

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2019-03-19 10:53 pm

how much does 4.97×10^21 molecules of CO2 weigh?

[匿名]

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2019-03-19 10:02 pm

How many milliliter of a 2.5 M MgCl2 solution contains 17.5 g MgCl2?

[匿名]

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2019-03-19 8:48 pm

Question; chemistry?

[匿名]

回覆: 3

2019-03-19 5:06 pm

chemistry carbon - carbon questions?

[匿名]

回覆: 1

2019-03-19 1:19 pm

How many decompositions per minute should you expect to observe in 200g of a certain wine?

[匿名]

回覆: 1

2019-03-19 10:01 am

Is O2Cl3 Ionic or Molecular?

[匿名]

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2019-03-19 4:39 am

Calculate the pH after 0.15 mole of NaOH is added to 1.10 L of a solution...?

[匿名]

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2019-03-19 10:07 am

When a saturated solution of Ca(OH)2 is stored, why is it best to be sure that some solid is present?

[匿名]

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2019-03-19 4:41 am

What volumes of 0.49 M HF and 0.49 M NaF must be mixed to prepare 1.00 L of a solution buffered at pH = 2.77? HF ____L NaF ____L?

[匿名]

回覆: 2

2019-03-19 5:15 am

Need help with this question.?

[匿名]

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2019-03-19 8:26 am

identify the conjugate acid base pairs in each of the following ewquations?

[匿名]

回覆: 4

2019-03-19 1:22 am

Find S20 for the arithmetic series 5+10+15+20?

[匿名]

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2019-03-18 12:41 pm

Calculate the pH of each of the following solutions. (a) 0.22 M KNO2 (b) 0.25 M NaOCl (c) 0.58 M NH4ClO4?

[匿名]

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2019-03-18 11:11 pm

Buffer question?

[匿名]

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2019-03-18 10:14 pm

P(A)= 0.20 P(B)= 0.25 P(A and B)= 0.10 What is P(B|A) ?

[匿名]

回覆: 4

2019-03-13 11:46 pm

College Algebra...applying Quadratic Equations...!!! Thank you!?

[匿名]

回覆: 2

2019-03-13 10:37 pm

Write the balanced equation for the dissociation of solid potassium chlorate in water?

sologuitar

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2019-03-13 5:48 pm

Ramp Equation?

sologuitar

回覆: 5

2019-03-13 5:47 pm

Find Linear Equation?

[匿名]

回覆: 1

2019-03-13 4:00 pm

What is the pH of a 0.0125M acetic acid solution?

[匿名]

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2019-03-13 1:07 pm

What will be the concentration of CH3OCH3 will be M after ___s have passed?

[匿名]

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2019-03-13 1:59 pm

Which of the following has the greatest electrical conductivity? B(s) CaCl2(l) Fe2O3(s) Mg(s)?

[匿名]

回覆: 1

2019-03-13 10:48 am

The reaction A +2B → products. = k[A][B]3. How will the factor rateRxn increase when [A] is doubled and [B] is trippled?

[匿名]

回覆: 5

2019-03-13 10:25 am

Determine a value of a such that one root of the equation ax^2+x-1=0 is five times the other root. Explain.?

[匿名]

回覆: 1

2019-03-13 9:32 am

A kite 100 ft above the ground moves horizontally at a speed of 12 ft/s. At what rate is the angle (in radians) between the string and the h?