wallace

How many electrons contain the ion that has 13 protons 10 electrons and 15 neutrons?

7 years ago

You have a 250ppm solution of K with KCl, you want to prepare a 0.00100 mole of Cl, how many mililiter should be diluted to prepare 1 liter of solution

7 years ago

A chemist added 3.15 grams of HNO3 to a solution of the same acid with concentration of 9 mol/L. dilutes the resulting solution up to the 100ml volume. The resulting solution will have what concentration?

7 years ago

A galvanic cell with e o cell = 0.30 v can be constructed using an iron electrode in a 1.0 m fe(no3)2 solution, and either a tin electrode in a 1.0 m sn(no3)2 solution, or a chromium electrode in a 1.0 m cr(no3)3 solution even though sn2+/sn and cr3+/cr h...

7 years ago

What is the volume of solvent needed for the preparation of an equal 10% title solution when using 15 mL of solute?

7 years ago

Calcium carbonate and sulfuric acid react according to the balanced reaction. CaCO3+ H2SO4 = CaSO4 + CO2 + H2O Starting from 300 grams of calcium carbonate with 3% impurities, what is the mass of calcium sulfate formed considering that the reaction is 90%...

7 years ago

Consider the titration of 20.00 ML of KOH 0.01 mol/L with HNO3 0.01 mol/L. Calculate the PH of the titration solution after the addition of the following titration volumes: A. 0.00 ml C. 20.00 ml B. 19.99 ml D. 25.00 ml

7 years ago

Calculate the oxalic acid mass required for neutralization of 25 ML of 0.1 M NaOH solution.Dihydrate Organic Diacid (H2C2O4.2 H2O, molar mass = 126.04 g/mol)

7 years ago

A solution was prepared with 100 ml of 0.1 mol/L acetic acid and 100 ml of 0.1 mol/l sodium acetate. The density of acetic acid is 1.05 g/mL Calculate the required volumes of each to prepare 25 mL of a buffer solution PH = 5.0. and calculate the PH. Data:...

7 years ago

Calculate the amount of hydrogen atoms in 0.75 mol of water molecules

7 years ago

n order to determine the concentration of bivalent nickel in environmental samples we can use the complexometric titration. A 100 mL sample containing Ni2 + was treated with 50 mL of 0.02 mol / L EDTA solution complexing all Ni2 + solution and leaving an...

7 years ago

A 0.01 M solution of a HBrO is 4.0% ionized. is the PH value of this acid? (Log4 = 0.6)

7 years ago

A 10 ml of hydrochloric acid solution of concentration equal to 0.1 mol per litre is added 90 ml of pure water. What's the pH of the final solution?

7 years ago

Determine the number of moles of calcium carbonate with 10% impurities, which reacts with 21.9 g of hydrochloric acid.

6 years ago

a 5.29 g sample of impure sodiun chloride was dissolved and dihuted to a total volume of 250 0 ml. If 25.0 mL of the sodium chloride solation required 28.5 ml, of 0 300 M AgNO3, solution to reach the equivalence point, using chromate indicator, what was t...

6 years ago

One mole of aluminum chloride (AlCl3), 26.98 grams of aluminum (Al), and 106.4 grams of chlorine (Cl). What is the percent composition of aluminum in aluminum chloride? A 3.700% B 20.22% C 25.40% D 79.81%

6 years ago

What is the concentration of a potassium iodate solution after you complete the following porcedure? Pipette 10 mL of a 0.31 M potassium iodate stock solution to a 100-mL volumetric flask and then add water to the mark.

6 years ago

Nitromethane (ch3no2) burns in air to produce significant amounts of heat. 2ch3no2(l)+3/2o2(g)→2co2(g)+3h2o(l)+n2(g) δhorxn = -1418 kj part a how much heat is produced by the complete reaction of 4.68 kg of nitromethane

6 years ago

In a reaction of ammonia production (NH3), 360g of nitrogen gas (N2) was reacted, generating a yield of 20%. What was the mass obtained from ammonia?

6 years ago

A W element that is in the IIA family combines with a Y element in the VIIA family and results in an ionic compound whose only likely formula is: (demonstrate the bond) a)WY b)Y²W c)WY² d)W²Y

6 years ago

During electrolysis of an aqueous NaOH solution in the anode, 2.8 L of Oxygen are released (under conditions considered normal). How much hydrogen is free in the cathode?

6 years ago

Find a pH of a 0.100 M solution of the weak acid HA. The pKa for the acid 5.0

6 years ago

Calculate the PH value of 1.00 L of a solution prepared by mixture of 1.00 mol HCl, 2.00 moles of NaOH and 1.50 moles of NH4Cl Kb (NH3) = 1.8 * 10 ^-5

6 years ago

If the Ksp of Zn (CN)2 (s) is 3×10^-16, what percentage of Zn2+ is precipitated when we know that [Zn 2+]=0.36M [CN-]=5×10^-3M Ksp=3×10^-16

6 years ago

why do we have to take the pssa

13 years ago

thank u

7 years ago

0.97% ??

7 years ago

thank you so much :)))

7 years ago