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Chemistry question please help? After performing the procedure of water of hydration, a student found the percent water in AlCl3 * 6 H2O to be 47.15% The actual percentage is 44.7% Determine the percent error in this experiment. Show your work.

error = difference between true and experiment values = 47.15 - 44.7 = 2.45 % error = error/true vale...

• Help with chemistry! please show work!! very confused?

At a certain temperature, Kw = 8.96 x 10-13?. What is the [H3O+] of pure water at this temperature? Give your answer using E notation AND 3 SIGNIFICANT FIGURES! the correct answer is 9.47E-7 (9.47 × 10-7) but i have no idea how to work it out!...

Kw = [OH][H3O] Since in water [oh]=[h3O], you can say [OH]=[H3O]=x. therefore you can say x^2 = Kw therefore...

The standard molar enthalpy of formation of NH3 is -45.9 kJ/mol. what is the enthalpy change if 6.31 g N2 and 1.96 g H2 react to produce NH3?

1. Find which is the limiting reactant. 2. Find how many moles of NH3 are produced when all the limiting...

• I need some help on my chemistry homework. Please show work so I understand. Thank you!?

75.50 mL of 0.655M hydrochloric acid, HCL, are titrated with KOH. It takes 45.70 mL to reach the equivalalence point. Calculate the molarity of the KOH. (show balanced equation) what is the pH of the solution in the erlenmeyer flask at the equivalalence...

HCl + KOH → H2O + KCl (75.50 mL HCl) x (0.655 M) x (1/1) / (45.70 mL KOH) = 1.08 M KOH I would...

• Chemistry question, please show the work so I can understand cause I have more problems like this?

A sample of potassium sulfate, K2SO4, weighing 0.0678 g is placed in a 25.0 mL volumetric flask. Enough water is added to dissolve the K2SO4, then the flask is filled to the mark and ...show more

(0.0678 g K2SO4) / (174.2598 g K2SO4/mol) / (0.0250 L) = 0.0156 mol/L K2SO4

• Can someone help me with these Chemistry questions? Please show work.?

7- What mass of ethanol must be added to 1,000 g of water to give a solution that freezes at -10.0 degrees C. 8- The solubility of oxygen in water at 3.0 ATM and 25 degrees C is ...show more

7. The freezing point depression constant for water is 1.86 C/m. So, from the desired freezing point...

• Composite Function question, show all work, I need help please!?

Composite Function question: If f(x)=sqrt(x-4) and g(x)=3x^2-21 find indicated composite function. Show all work. I've ended up with (gof) (x)=sqrt(3x^2-25) but my online ...show more

g of f means ... put the function F INTO G f(4) means.. everywhere there is an unknown put 4 in that...

Charlie has X state quarters.Ty has 3 more quarters that charlie has.Vinne has 2 times as many quarters as ty has.write and simplify an expression to show how many state quarters the ...show more