Can I get some help please? Thanks!

2 Answers
Aug 21, 2017

1086 mm Hg

Explanation:

Using the slope method

The change in pressure per degree C
20oC10oC=10oC
750726=2410=2.4mmHg1oC

The change in pressure per degree C second interval

# 40^o C - 20^oC = 20^oC

800750=5020=2.5mmHg1.0oC

The change in pressure per degree C third interval

880800=8030=2.6mmHg1.0oC

The change in pressure per degree C fourth interval

960- 880 = 80/30 = (2.6mm Hg)/1^oC #

averaging the change in pressure for the four intervals

2.4+2.5+2.6+2.64=2.525

The change in temperature 150-100 = 50 so

50oC×2.525mmHg10C=(126.25mmHg)

Adding this change in pressure to the value of 960 gives

960 + 126 = 1086 mmHg.

this is an approximate value as the the intervals do not give a perfect straight line slope.

Aug 21, 2017

I get p=1089 mmHg

Explanation:

I would use Excel or a graphing calculator to plot a graph of p vs. t and get an equation for the line of best fit.

I don’t have a graphing calculator, so I plotted the data in Excel.

Plot

Excel told me that the equation of the best-fit line was

y=2.608x+698.01 or

p=2.608t+698.01

Substituting t=150 °C, I get

p=(2.608×150+698.01)lmmHg=(391.2 + 698.01) mmHg=1089 mmHg