laney

This page lists questions and answers that were posted by visitors named laney.

Questions

The following questions were asked by visitors named laney.

What does class-system and class-state mean? I can't find the meanings in the dictionary.

Calculate the number of mL you would use to prepare 5.0 L of 0.20 M NaOH from a 5.23 M stock solution.

How do you calculate the number of mL you would use to prepare 5.0 L of 0.20 M NaOH from a 5.23 M stock solution.

5.00 g of octane are burned in a bomb calorimeter containing 2.00 * 10^2 g of water. how many Calories of energy are released if the water temperature increases 6.00 degrees C?

Calculate the boiling point of a 4.35 m benzene solution in phenol. (phenol bp=181.75 degree C and Kb=304 degree C/m)

Consider: C7 H16(L) + 11 O2 (G) yields 7 CO2 + 8 H2O (L) delta Hreaction = -4130 kJ How much energy is released when 2,000 moles of C7 H16 is combusted?

The pH of a solution prepared by mixing 50.0 mL of 0.125 M KOH and 50.0 mL of 0.125 M HCl is __________. i know the answer is 7.00, but im not sure how to solve it, do i create an ice chart?

The pH of a solution prepared by mixing 50.0 mL of 0.125 M KOH and 50.0 mL of 0.125 M HCl is __________. i know the answer is 7.00, but im not sure how to solve it, do i create an ice chart?

Answers

The following answers were posted by visitors named laney.

i got a huge number, is 191.20 correct?

ok thank you!! i posted a new question! i have a test tomorrow morning and im doing a practice exam and a few questions stumped me!!

do i use the 5.00 g or the 2.00 * 10^2 g?

ok so it'd be (2.00*10^2)(6.00 degree C) and then what would be the specific heat?

ok, we didn't do joules in class, so hopefully that's what my teacher wants. thank you!

so i would set the problem up like this.... 4130kJ/1 mole = xkJ/2000 moles ???

i got 2.065 kJ/mole

ok so then i set it up wrong it should be 4130 kj/1 mole = 2000 moles/kj and that time i got 8260000 i don't know if that is right because the kj would cancel out too

ok so (2000moles/1)(4130kj/1mole) = (kj/2000 moles)(2000 moles/1) (2000)(4130kj) = kj now what?

ok that's where i got the number 8260000kj=kj uuuggggh i don't know what im doing wrong!!