Chemistry

Oxidization and reduction chemistry questions

1. Use the changes in oxidation numbers to identify which atoms are oxidized and which are reduced in each reaction: a) HgO(s) --> Hg(l) + O2(g); Hg is reduced and O is oxidized b) Al(s) + MnO2(s) -

How do you solve this titration problem

If I used 22.7mL of base (1.0M NaOH) for the indicator to change color, how do I find out the concentration of the solution that changed color?-For this problem you need to use M1V1=M2V2. Your M1 is t

If 1.00L of a gas at 30.0C and 720 mmHg has a mass of 2.00g, the mass of one mole of the gas is

A. 22.4g B. 44.8g C. Between 22.4 and 44.8g D. 52.5g-D. 52.5g First calculate the volume of gas at S T P using formula P1V1/T1 = P2V2/T2 P1 = 720mm, V1=1L, T1 = 273 + 30 = 303, S T P conditions P2=76

Mass and Moles calculations

*What is the moles of 1) BrI when the mass is 26.2 mg 2) CF2Cl2 when the mass is 1.24 kg *what is the mass of 1) CO2 when the moles are 0.0116 2) CO when the moles are 0.0127 the steps with th

Compute [Mg^2+] and [OH-] for a solution that is prepared by dissolving 3.2*10^-5 mole of magnesium hydroxide

Magnesium hydroxide is a strong base. Compute [Mg^2+] and [OH-] for a solution that is prepared by dissolving 3.2*10^-5 mole of magnesium hydroxide in 100.0 mL of water. a) [Mg^2+] = 3.2*10^-4M, [OH-

Sum of bond enthalpies for an exothermic reaction

Is the sum of bond enthalpies of reactants in an exothermic reaction higher or lower than the sum of bond enthalpies of the products? I infer that it obviously must be higher if the enthalpy change f

Help with a chemistry problem

This ones about molality/colligative properties. A solution that contains 13.2 g of solute in 250.0 g of carbon tetrachloride (CCl4) freezes at -33 C. What is the molecular weight of the solute? I k

How is it possible fro one tank of helium to fill 700 balloons

How is it possible fro one tank of helium to fill 700 balloons? Also, Why is more gas needed to fill helium balloons on a cold day? PLEASE PLEASE PLEASE HELP!!! Thank you :P-a) It is pressurized in t

What is the number of moles of a solute in 650 ml of a 0.40 M solution

I dont have any multiple choice options, so I have to solve it from scratch. I cant do so because I dont even know where to start. Any help would be greatly appreciated. Thank you.-molarity = moles /

Two concentration chemistry questions I need serious help on!!

Please show work and explain! I need to know this stuff for a test! My teacher just doesnt teach us.. 1. 2SO3(g)-> 2SO2 (g) + O2 (g) Calculate K(eg) for this reaction if the equilibrium concentratio

H2O+NaOH+Al is the formula of chemicals added together in the flask. where might the hydrogen gas come from

From the breaking up of the water (H2O)

What is the pH in this problem

Phenylacetic acid (C6H5CH2COOH, or HPAc for short) builds up in the blood of people with phenylketonuria, an inherited disorder that, if untreated, causes mental retardation and death. The pKa of HPAc

Some chemistry questions please help...

whoever answers the most of them or all if you can :) will get the 10 points. the ! are really arrows that dont show up right on this thankss for the help Which of the following metals or nonmetals a

Help please with stoichiometric calculations

what mass of water vapor forms if 28.6g of propane is burned? a) what is the balanced equation b) stoichiometric calculations-C3H8+5O2-->3CO2+4H2O M(C3H8)=44g/mol 28.6/44=0.65mol 1:4=0.65:x x=2.6mol

Can you please balance these equations? and if you can do it using the algebraic method? (plz help)

1. H2S + H3AsO4 ------> As2S3 + S + H2O 2. H2S + H3AsO4 ------> As2S3 + S + H2O 3. Ca10F2(PO4)6 + H2SO4 ---------->Ca(H2PO4)2 + CaSO4 + HF thanks a lot this is been taking me forever and i cant do it