06/07/21

Stoichiometry Problem
When a mixture of sulfur and metallic silver is heated, silver sulfide is produced. What mass of silver sulfide is produced from a mixture of 3.0 g Ag and 3.0 g... more
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06/07/21

Combined Gas Law
A 42.0-g sample of krypton gas has a volume of 11.2 L at STP. The sample is heated to 112ºC and compressed to a volume of 6.83 L. What is the resulting pressure?  2.A gas takes up a volume of 17.0... more
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06/06/21

What is the y-intercept and slope of this table?

X. Y10. 43-2. -56. 27
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06/06/21

Unit 1 Chemistry 122
When a sample of food is burned, it caused the temperature of the water in a calorimeter containing 780 g of water to increase by 8.9•C. Calculate the amount of heat gained by the water. What is... more
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06/06/21

When a sample of food is burned, it caused the temperature of the water in a calorimeter containing 780 g of water to increase by 8.9•C. Calculate the amount of heat gained by the water
This is for Chemistry 122
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06/06/21

How much heat is needed?
Ethanol (C2H5OH) melts at -114°C. The enthalpy of fusion is 5.02 kJ/mol. The specific heats of solid and liquid ethanol are 0.97 J/gK and 2.3 J/gK, respectively. How much heat (kJ) is needed to... more
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06/06/21

What is the enthalpy change?
The enthalpy change for converting 1.00 mol of ice at -50.0°C to water at 90.0°C is _____ kJ. The specific heats of ice, water, and steam are 2.09 J/gK, 4.18 J/gK, and 1.84 J/gK, respectively. For... more
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06/06/21

Vitamin C (ascorbic acid) contains 40.92 % C, 4.58% H, 54.50 % O, by mass. The experimentally determined molecular mass is 176 amu. What are the empirical and chemical formulas for the ascorbic acid?​
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06/06/21

Chem Units 3 and 4
A typical passenger vehicle uses about 2.5 x 106 grams of C12H26 per year. How many moles of C12H26 is that? Using the last question, how many grams of CO2  could this reaction create under perfect... more
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06/06/21

Chemistry Unit 6

How many moles of CO2 is absorbed into the ocean if 1212 L of CO2 enters the ocean at 1 atm on a 35oC day?
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06/06/21

Chemistry Unit 6
At ocean level, or 101.3 kPa, 1212 L of CO2 enters the atmosphere. How many liters of CO2 would this be at the top of Mt. Everest, or 33 kPa?
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06/05/21

Chemistry Class
The molarity of CO2 in Earth’s atmosphere is roughly 0.04 M. How many moles of CO2 can be found in 1.3 x 1012 L of atmosphere?
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06/05/21

What is the number of moles?
The vapor pressure of  CCl3F at 300 K is 856 torr .  If 12.0 g of CCl3F is enclosed in a 1.2 L container, calculate the number of moles of CCl3F in the gas phase.
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06/05/21

how many moles of CO2 and g of CO2
How many moles of CO2 that exert a pressure of 1.03 atm at a volume of 32.5 L and a temperature of 32.0 oC? What is the mass of the CO2? (R = 0.0821)
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06/05/21

Ideal gas law problem
How many grams of water would be produced if 20.0 liters of oxygen were burned at a temperature of -10.0 C and a pressure of 1.3 atm. Use the following equation                            2 C8 H18... more
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06/05/21

Ideal gas law problem
What volume exist when 0.450 moles of gas at 25.0°C has a pressure of 52.7 kPa?
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06/05/21

Ideal Gas law Problem
After the child has exhaled all of this gas, it becomes sick. If its temperature rises to 42.0 C and it can hold 0.150 moles of air in its lungs at a pressure of 1.15 atm, what is the new volume... more
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06/04/21

general chemistry chapter 6
Suppose a boil water notice is sent out advising all residents in the area to boil their water before drinking it or using it for cooking. You need to boil 19.0 L of water using your natural gas... more
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06/04/21

general chem chapter 6
When 0.374 g of sodium metal is added to an excess of hydrochloric acid, 3890 J of heat are produced. What is the enthalpy of the reaction as written?2Na(s)+2HCl(aq) ----- 2NaCl(aq)+H2(g)
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06/03/21

What is the molarity of a solution that contains 47.8 grams of LiCl dissolved to form 250.0 mL of solution?
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06/03/21

A youth group is planning a trip to a local amusement park. They are taking a van which holds 10 people. It will cost $25 for parking and tickets to enter the park are $18 per person.
can someone tell me what the answers 1. Identify the independent and dependent variables for this situation. (5 points)2. Create a table to represent the situation, showing the possible total costs... more
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06/03/21

Hello. It may not seem like it but I am under pressure and need so much help with my chemistry as soon as possible please please please ok please please please please

1.) 2 NH3 + 3 CuO --> 3 Cu + N2 + 3 H2OIn the above equation how many moles of N2 can be made when 165.7 grams of CuO are consumed?Round your answer to the nearest tenth. If you answer is a... more
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06/03/21

In a solution with a [OH] of 1.5 x 10-4 M, what is the [H3O+]?
Hi, I've been stuck on this question for a bit. Help would be greatly appreciated!
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06/03/21

Hi can someone please help me with this. Thank you!!
calculate the concentration of the hydrogen ion/hydroxide ion inthe samples below by its pOH level. Identify if the solution is acidic, basic, or neutral.1. Calculate the hydroxideion concentration... more
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06/03/21

Gas Law Problem

Boyles Law: 1. A cylinder of compressed gas has a volume of 3.85 L and a pressure of 463 kPa. What volume would the gas    occupy if it were allowed to escape into a balloon at a pressure of 110.0... more
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