Question

A mixture of two gases exerts a total pressure of 3.65 atm. If the partial pressure of one of the gases is 1.86 atm, what is the partial pressure of the other gas in the mixture?
Answer
0.510 atm
1.79 atm
1.96 atm
6.79 atm


If 45 g of LiF are dissolved in 1.8 kg of water, what would be the expected change in boiling point? The boiling point constant for water (Kb) is 0.51 °C/m.
Answer
0.49°C
0.98°C
1.9°C
3.5°C

Answer 1

1. cmon just substract them cause total pressure is sum of partial pressures
2. calculate n(LiF) and divide with water mass and multiply with Kb

Answer 2

I wouldn't know because the lessons so not teach this.

Answer 3

http://en.wikipedia.org/wiki/Boiling-point_elevation

Answer 4

I tried working out #2 but i think i did something wrong. I got number 1

Answer 5

out of the head id say 0.49°C

Answer 6

I'm sorry to bother but do you know this one?

Answer 7

The concentrations of a reaction are measured to determine reaction rates. If the concentration of the reaction's product increases from 0.0250M to 0.484M in 3.00mins, determine the average reaction rate during this time period?
Answer
1.28 × 10-3 mol/(L × s)
2.55 × 10-3 mol/(L × s)
5.10 × 10-3 mol/(L × s)
1.02 × 10-2 mol/(L × s)

Answer 8

easy one, c2-c1/t = 2.55 × 10-3 mol/(L × s)

Answer 9

Which answer provides the correct name for name the following hydrocarbon?

Answer 10

can you explain how to name something like this? I do not have a clue :/

Answer 11

4 - methyl - hex-2- yne or 4-methyl - 2 -hexyne