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23 Nov 2019

Calculate the density of the following liquid. Report your answer with the correct number of significant figures, in scientific notation, and with the correct units.

Mass of flask: (4.865x10^1) g

Mass of flask and water: (8.8x10^1) g

Mass of flask and liquid: (1.18x10^2) g

Density of water at ambient temp: (9.982x10^-1) g/mL

please put answer in scientific notation

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Lelia LubowitzLv2

4 Sep 2019

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Please help me step by step if you can. I am having a hard time with the conversion. Thanks in advance.

1. If one mole of a substance has a mass of 58.44 g, how many moles are in 1.0 g of the substance? Express your answer in moles using the correct number of significant figures. Do not enter your answer using scientific notation.

2. Calculate the mass of 12 mL of a substance whose density is 15.3 g/mL. Express your answer in grams using the correct number of significant figures. Do not enter your answer using scientific notation.

An empty flask and stopper is weighed in with a mass of 75.121 grams. To this flask 2 mL of an unknown liquid is added and then heated in a boiling water bath at 96Â°C. When all of the unknown liquid is vaporized the flask is removed from the bath and cooled. During the cooling the stopper is periodically opened just enough to let air in to equilibrate the internal and external pressures. During the experiment the laboratory barometer reads the pressure in the lab as 648 mm Hg. The flask is then weighed and found to have a mass of 76.036 grams. The volume of the flask is then measured and found to be 271.2 mL.

A) What is the pressure of the vapor in the flask in atm? (Report your answer to 3 significant figures.)

B) What was the temperature of the vapor in K? (Report your answer to 3 significant figures.)

C)What was the volume of the flask in liters? (Report your answer to 4 significant figures.

D) How many moles of vapor are present? Report the answer in scientific notation, using the following format #.## x 10^# moles. (Report your answer to 3 significant figures.) An example would be 1.23 x 10^-2 moles.

E) What was the mass of vapor that was present in the flask? (Report your answer to 3 significant figures.)

F)What is the molar mass of the unknown liquid? (Report your answer to 3 significant figures.)

please help me with whatever you can. thank you lots in advance

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