Question

The vapor pressure of ethanol at 25 degrees C is 7.83kPa . Calculate the vapor pressure in atm.
Round answer to 3 significant digits.

Answer 1

1 Pascal equals 9.8692 * 10^-6 atmospheres
7.83 kPa = 7.83 * 1000 Pa = 78300 Pa

Answer 2

........

Answer 3

So is it a = amount, t = tempurature, m = measure? A is 78300, t is 25 and m is what we are finding?

Answer 4

Mymathhomework this is not a question on exponential decay formula, or, for that matter, any formula. It is only a unit conversion question

Answer 5

So 78300 is the answer? What is the atm for?

Answer 6

Pa means 'pascals' and atm means 'atmospheres', both are units of pressure

Answer 7

So I don't need to use the 25 degrees C any where?

Answer 8

As far I I know I don't think the 25 degree C is relevant to the conversion

Answer 9

OK, so it says to round to 3 significant digits so I will need to put it in scientific notation like this: 7.83 X 10^4 right? or is the 4 negative?

Answer 10

First you get 7.83 kPa = 7.83 * 10^4 Pa
Then convert it to atm by using the relation 1 Pa = 9.8692 * 10^-6 atm, this gives you
7.83 kPa = 7.83 * 10^4 * 9.8692 * 10^-6 atm
= 77.275836 * 10^-2 atm
= 0.77275836 atm
Now round to three significant digits,
= 0.773 atm