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College Chemistry Chemistry General Chemistry

12/08/14

chemistry, A 8.10-L container holds a mixture of two gases at 51 °C.

A 8.10-L container holds a mixture of two gases at 51 °C. The partial pressures of gas A and gas B, respectively, are 0.308 atm and 0.520 atm. If 0.120 mol of a third gas is added with no change in... more

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College Chemistry Chemistry General Chemistry

12/08/14

A gaseous compound has a density of 1.56 g/L at 27.0 °C and 1.33 atm. What is the molar mass of the compound?

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College Chemistry Chemistry General Chemistry

12/08/14

Chemistry Ideal Gas Problem, A hot air balloon is filled with 1.19 × 106 L of an ideal gas on a cool morning (11 °C)

A hot air balloon is filled with 1.19 × 106 L of an ideal gas on a cool morning (11 °C). The air is heated to 113 °C. What is the volume of the air in the balloon after it is heated? Assume that... more

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College Chemistry Chemistry Chemical Reactions General Chemistry

12/06/14

Chemistry, find standard heat of reaction of this reaction. Please help me understand how to do these problems

This question is about the reaction4HCl(g)+O2(g)-->2H20(g)+2Cl2(g)A) Using the values of ΔfH°, find the standard heat of the reaction of this reaction.B) Using average bond energies, estimate... more

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College Chemistry Chemistry Chemistry Measurement Word Problem Chemistry Lab

12/05/14

Mass of NaOH needed to make 500mL of 0.1M NaOH solution?

I'm working on a solutions lab and would like someone to look over my calculations please. The question asked: "What mass of solid NaOH is needed to make 500mL of 0.1M NaOH solution?" My... more

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College Chemistry Chemistry General Chemistry

12/04/14

Chemistry Homework, need some help

If 29.5 moles of an ideal gas is at 2.29 atm at 32.70 °C, what is the volume of the gas?

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College Chemistry Chemistry Chemical Reactions General Chemistry

12/04/14

Chemistry Question, I need some help please

This question is about the reaction 4HCl(g)+O2(g)-->2H20(g)+2Cl2(g)A) Using the values of ΔfH°, find the standard heat of the reaction of this reaction.B) Using average bond energies, estimate... more

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College Chemistry Chemistry General Chemistry Chemistry Lab

12/02/14

Chemistry Lab, Calculated Concentration Problem. I really need help!!

If there was an impurity in KHP, how would the concentration of the KHP solution differ from that calculated? Would the calculated concentration of the KHP solution would be higher/lower/ or... more

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College Chemistry Chemistry

12/02/14

chemistry help please! I really need it

Given the following enthalpies of reaction N2(g)+2O2(g)-->2NO2(g) ?H°1=+66.4kJ 2NO(g)+O2(g)-->2NO2(g). ?H°2=-114.2kJ Calculate the enthalpy for the reaction for ... more

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College Chemistry Chemistry Chemistry Homework

11/25/14

How do I do this? Chemistry HW

The atmospheric pressure on the surface of Venus is about 100 atm. This pressure is equal to____torr?

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College Chemistry Chemistry Chemistry Homework

11/24/14

Chemistry, How do I figure this out?

When you add 0.205 g of sodium metal to an excess of hydrochloric acid, you find that 2130 J of heat are produced. What is the enthalpy of the reaction as written below? ... more

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College Chemistry Chemistry Chemistry Homework

11/24/14

Chemistry Question, Need some help to figure this one out

Use the bond energies provided to estimate ΔH°rxn (in kJ) for the reaction below.XeF2 + 2 F2 → XeF6Bond Bond energy (kJ/mol)Xe-F 147F-F 159Answer: kJ ?

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College Chemistry Chemistry Solubility

09/26/14

How to solve these questions in Chemistry?

How do you solve this one question in Chemistry?1. The solubility of salt ar 25°C is about 385 g/L. If the temperature is raised to 50°C, then: _______ more salt would dissolve _______ less salt... more

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College Chemistry Chemistry Basic Chemistry Solubility Rules

09/22/14

What is the net ionic equation when these compounds are combined/reacted?

I am having a really hard time understanding aqueous reactions and net ionic equations in chemistry. I would really appreciate some step-by-step instructions on these questions... 1) Consider... more

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