1. If the barometer reading is recorded to be higher than the actual value. What

Question

1. If the barometer reading is recorded to be higher than the actual value. What effect does this error have on the reported value for the molar mass of the compound? Briefly explain (Too high, Too low, Unchanged)? 2. If water bath only reached a temperature of 95.8 C but you still used the value of 100 C in the calculationm what effect does this error have on the reported value for the molar mass of the compound? Briefly explain(Too high, Too low, Unchanged)? 3. A 250 mL Erlenmeyer flask has a measured volume of 287 mL. If the experiment is preformed with this flask but the volume of 250 mL is mistakenly used to determine the molar mass of the compound. What effect does this error have on the reported value? Briefly explain (Too high, Too low, Unchanged)? 4. If when preforming the experiment you add 6 mL of volatile liquid instead of 4 mL. What effect does this error have on the reported value for the molar mass of the compound? Briefly explain?

Explanation / Answer

1. If the barometer reading is recorded to be higher than the actual value. What effect does this error have on the reported value for the molar mass of the compound? Briefly explain (Too high, Too low, Unchanged)

the higher the pressure the more moles are in the flask.

The ideal gas equation

PV = nRT

P = pressure
V = volume
n = mol
T = temp in kelvin
R = gas constant

Here we can see that the number of moles of compound is directly proportional to the pressure.

Molar mass = amount in g / number of moles

If the barometer reading is recorded to be higher than the actual value then we will get higher number of moles of compound than the actual value.

This higher number of moles will calculate the lower molar mass value than the actual value.

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