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Help with energy problem

Im not asking for the answer per say but does anyone know how to do this? Calculate qsystem and qsurroundings Calculate the qsystem and qsurroundings for the reaction and then state whether the reac

Why do enantiomers have the same properties in an isolated system

I would really love to know the conceptual explanation. Its bothering me.-Try to think of enantiomers as your left & right hand. They can do all the same things (open, close, wiggle fingers, make fist

How do you balance this equation?!?!?!

Ive been staring at this equation and I cant seem to balance it. Please help! Cu + HNO3 yields to Cu(NO3)2 + NO2 + H20 I dont know how to do the subscripts but I think if you sound it out and re wr

Chemistry help!!! please!

A 0.9157-g mixture of CaBr2 and NaBr is dissolved in water, and AgNO3 is added to the solution to form AgBr precipitate. If the mass of the precipitate is 1.6840 g, what is the percent by mass of NaBr

Moles of Gold per cubic mile

The Atlantic Ocean contains about 8.5 lb (1 lb=454 g) of gold per cubic mile. How many moles of gold are there per cubic mile?-Mol.mass of Au = 197g/mol (8.5lb x 454g/lb) / 197g/mol = 19.6 moles of g

How do i fine density given g/mol and ml

molar mass 153.33 g/mol of POCl3 and i have .12ml of POCl3 How do i find density of POCl3?-Not enough information. Working backwards from the information given: (1.645 g/mL) x (0.12 mL) = 0.1974 g PO

Help me calculate my average!

if my first midterm is 30% of my grade and I made a 60, and then my second midterm is worth 30% and I plan to make a 100, and then my final exam is worth 40% and I will most definitley make a 100. Wha

How do you determine the molar mass in this problem

A solution was made by dissolving 3.75g of a nonvolatile solute in 108.7g of acetone. The solution boiled at 56.58 degrees C. The boiling point of pure acetone is 55.95 degrees C and K = 1.71 degrees

How are new theories accepted by scientists

By peer review...after a scientist/group of scientists formulate an explanation for something, test that explanation, and publish all the details, all other scientists in that field will try to find s

Standard enthalpy of formation of Benzoic Acid

When Benzoic Acid is burned, the enthalpy of combustion is -3223.6 kJ/mol. Use this information and tabulated values of the standard enthalpies of formation of liquid water and carbon dioxide to calcu

Find the amount of the solution in Moles

Find the amount, in moles, of solute dissolved in the following solution: 1)4dm^3 of a 2 mol dm^-3 solution. 2)25.0cm^3 of a 0.150 mol dm^-3 solution. 3)24.35 cm^3 of a 0.125 mol dm^-3 solution. Tha

Need organic chemistry help...what is the stereogenic center of 1,1,2-trimethylcyclobutane

can someone please help me out with this question im so confused...greatly appreciated..-Carbon #2!! Draw it out. First of all it is cyclo butane. It is a butane (contains 4 carbons) and a cyclo comp

How to tell if atoms are collinear

For example, CH3CCCH2CH3. I can draw the lewis structure but Im having trouble telling which atoms are collinear. How can you tell without using a molecule kit?-H3C-C:::C-CH2-CH3 Triple bonds are alw

Calculate the pH of a 0.0396 M solution of a weak acid whose ionization constant Ka is 9.54 x 10^-3

Every time I solve for [H+], I end up with a negative number, and since you cant take the negative log of a negative number to find pH, I cant solve this! Did I do something wrong to end up with a ne

Is my answer right?: What is the speed of an electron that has a de Broglie wavelength of 191 nm

I got: (6.626x10^-34)/(9.11x10^-31)(1.91x10^-… 3803.02 I entered this answer and the computer keeps telling me its wrong? Please help >.-wavelength = h / m v v = h / m x wavelength v = 6.626 x 10^-
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