126 Answered Questions for the topic College Chemistry

Which of the following compounds contains a nonpolar covalent bond-

MgF2 NaCl H2O N2

AgNO3(aq)+KCl(aq)?AgCl(s)+KNO3(aq)

Part AWhat mass of silver chloride can be produced from 1.19L of a 0.293M solution of silver nitrate?Express your answer with the appropriate units.mass of AgCl =Part BThe reaction described in... more

After 80.0 min, 26.0% of a compound has decomposed. What is the half-life of this reaction assuming first-order kinetics?

After 80.0 min, 26.0% of a compound has decomposed. What is the half-life of this reaction assuming first-order kinetics?

When 2.35 g of a nonelectrolyte solute is dissolved in water to make 755 mL of solution at 22 °C, the solution exerts an osmotic pressure of 835 torr.

When 2.35 g of a nonelectrolyte solute is dissolved in water to make 755 mL of solution at 22 °C, the solution exerts an osmotic pressure of 835 torr. 1)What is the molar concentration of the... more

chemistry question

At –13.5 °C (a common temperature for household freezers), what is the maximum mass of sucralose (C12H19Cl3O8) you can add to 3.00 kg of pure water and still have the solution freeze? Assume that... more

A solution is made by dissolving 0.504 mol of nonelectrolyte solute in 823 g of benzene. Calculate the freezing point, Tf, and boiling point, Tb, of the solutio

A solution is made by dissolving 0.504 mol of nonelectrolyte solute in 823 g of benzene. Calculate the freezing point, Tf, and boiling point, Tb, of the solution. Constants may be found here.

Chemistry Convert the following quantities:

8.87 x 10^27 P4O10 molecules ---->  _____ atoms   1.129 x 10^20 formula units PbCl4 ----> _______ mol ions

label the phase diagram for carbon dioxide

label the phase diagram for carbon dioxide  I am having trouble with this.

chemistry How much heat energy is required to boil 20.5 g of ammonia, NH3? The molar heat of vaporization of ammonia is 23.4 kJ/mol.

How much heat energy is required to boil 20.5 g of ammonia, NH3? The molar heat of vaporization of ammonia is 23.4 kJ/mol.

Calculating E° Problem, just need to be pointed in the right direction! Double Karma points for any advice offered!

Okay, so I have a half reaction (a reduction), Cd(IO3)2(S) + 2e- ----> Cd(s) + 2IO3-, for which I need to calculate E°. E° for Cd2+ --> Cd(s) is given as -0.402V, and Ksp for Cd(IO3)2 is... more

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

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?

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?

Chemistry STP? How many molecules are there in an ideal gas with a volume of 5.73 L at STP?

How many molecules are there in an ideal gas with a volume of 5.73 L at STP?

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

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

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

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?

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

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

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

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?

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

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 ?

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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