Chemistry, 22.11.2019 05:31 ivanyeli4520

Ethylene glycol, c2h6o2, a nonelectrolyte, is added to the water in a radiator to give a solution containing 0.75 mole of ethylene glycol in 1 kg of water (solvent). what is the boiling point of the solution?

Answers: 1

Show answers

Answers

Answer from: SMURFETTE86

Answer : The boiling point of the solution is 101.4^oC

Explanation :

Formula used for Elevation in boiling point :

$\Delta T_b=i\times k_b\times m$

or,

$T_b-T^o_b=i\times k_b\times \frac{n_2}{w_1}$

where,

T_b = boiling point of solution = ?

T^o_b = boiling point of water = 100^oC

k_b = boiling point constant of water = 1.86^oC/m

m = molality

i = Van't Hoff factor = 1 (for non-electrolyte)

n_2 = moles of solute (ethylene glycol) = 0.75 mole

w_1 = mass of solvent (water) = 1 kg

Now put all the given values in the above formula, we get:

$(T_b-100)^oC=1\times (1.86^oC/m)\times \frac{0.75mole}{1kg}$

T_b=101.4^oC

Therefore, the boiling point of the solution is 101.4^oC

Answer from: Quest

Sugar and water are chemically combined.(a solution is chemically combined while a mixture is mixed together without bonding the molecules)

Answer from: Quest

Answer: abeexplanation:

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.

Another question on Chemistry

Chemistry, 21.06.2019 23:00

Which statement describes covalent bases? they have hydroxide ions. they produce hydrogen ions. they are often amines. they are named the same as ionic compounds.

Answers: 3

Answer

Chemistry, 22.06.2019 02:30

List four observations that indicate that a chemical reaction may be taking place

Answers: 1

Answer

Chemistry, 22.06.2019 05:30

What is the mass of 4 molecules of co2

Answers: 1

Answer

Chemistry, 22.06.2019 05:40

Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml

Answers: 2

Answer

You know the right answer?

Ethylene glycol, c2h6o2, a nonelectrolyte, is added to the water in a radiator to give a solution co...

Questions