Using the Ideal Gas Law or any of the equations you found in questions A-‐D, answer the following questions about gases. Assume ideal behavior! Be sure to put all values into the SI units (pressure in atm, the temperature in K, volume in L).
Useful Conversion Factors and the Gas Constant:
Quantity
Pressure
1 atm = 760 torr
1 atm = 101 kPa
1 mmHg= 1 torr
Gas Constant R=0.0821 L*atm/mol*K
1. A rigid container (25 mL) filled with oxygen gas has a pressure of 699 torr at a temperature of 25oC. How many moles of oxygen are in the container?
2. A 57.8-‐mL sample of gas in a cylinder is warmed from 20oC to 120oC. What is the volume at the final temperature?
Part II. Stoichiometry with Gaseous Reactants/Products
We now have a new way to find the moles of a compound! If a chemical is in the gaseous state, it is pretty hard (read: impossible) to measure the mass of the gas on a balance. Therefore, to determine the number of moles of a gaseous reactant (or product) in a chemical reaction, scientists measure the temperature, pressure, and volume of the gas. Using PV=nRT allows us to calculate the number of moles-‐ now ‘n’ can be used just like we always use it!
1. How many grams of Li3N can form when the following chemicals are allowed to react according to the reaction below? Excess solid Li reacts with 50 mL of nitrogen gas (1.23 atm, 293 K).
6 Li (s) + N2 (g) --> 2 Li3N (s)
Answers: 3
Chemistry, 22.06.2019 14:00
8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.
Answers: 3
Chemistry, 22.06.2019 17:30
98 points you will be galileo perform the experiment to determine if objects with different mass fall at the same, or different, rates in the air and in a vacuum. before you conduct your experiment, you need to form a hypothesis. a hypothesis is a prediction of what you think will happen in the experiment. the hypothesis is a statement that describes “if” a certain set of circumstances are present “then” there will be a specific result that will occur. record your hypothesis here: record the results from step one of the experiment (dropping the objects in the air): first trial: second trial: third trial: record the results from step two of the experiment (dropping the objects in a vacuum): first trial: second trial: third trial: did the experiment support your hypothesis? using the data from your experiment, describe why you believe your hypothesis was either proven or disproven. what forces were acting on the objects dropped in the air? what force was acting on the objects dropped in the vacuum? part two: comparing forces choose two forces and compare and contrast these forces. you must provide two ways that they are alike and two ways that they are different. you may make a list, write in paragraph form, or make a chart. choose two forces and compare and contrast these forces. these must be different forces than used in the prior question. provide two ways that they are similar and two ways that they are different. you may make a list, write it out, or make a chart.
Answers: 3
Using the Ideal Gas Law or any of the equations you found in questions A-‐D, answer the following q...
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