Recent content by viper2308

Ok I just got the from the periodic table. So the isotope information is unnecessary?

Homework Statement A bar of copper has dimensions 0.5605 ft. x 3.545 in x 5.722 cm. The density of copper is 8.921 g / cm3. Copper contains 2 isotopes, 63Cu (69.09% abundant) and 65Cu (30.91% abundant). How many neutrons are in the bar of copper? The attempt at a solution I took the...

Thank you, I forgot how to distribute for a second.

I distributed the \sqrt{x} and replaced with u's I then got \int u-u^(1/2) This let's see where the -2/3x^(3/2) comes from but I still don't understand where the 2/5x^(5/2) comes from.

Homework Statement \int (X-1) \sqrt{X} dx The Attempt at a Solution It is multiple choice, I believe the answer is either (2/5)x^(5/2)-(2-3)x^(3/2)+c or (1/2)x^2+2x^(3/2)-x+c I have tried to find the derivatives of both these answers yet neither of them gave me the correct...

Homework Statement Calculate the freezing point and boiling point of each of the following solutions using the observed van't Hoff factors in Table 11.6. (a) 0.070 m MgCl2 Temp Freezing? Temp Boiling? (b) 0.020 m FeCl3 Temp Freezing? Temp Boiling? Homework Equations...

Homework Statement A 22.0 g sample of ice at -12.0°C is mixed with 120.0 g of water at 86.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.08 and 4.18 J/g°C, respectively, and the enthalpy of fusion...

Homework Statement How many unpaired electrons are present in each of these species and what is the ground state? Given:1s2 2s2 3p1 Homework Equations none The Attempt at a Solution what is the ground state? I can find the number of unpaired electrons.

Homework Statement Which of the following electron configurations correspond to an excited state? Identify the atoms and write the ground-state electron configuration where appropriate. 1s2 2s2 2p4 3s1 [Ar]4s2 3d5 4p1 Homework Equations none The Attempt at a Solution I have no...

Thank you, I wish my teacher would have told me this.

Homework Statement How many electrons in an atom can have the following designations? 5px 7py 6dxy Homework Equations None that I know of The Attempt at a Solution I know how to find the number of electrons in a 5p designation but the subscript x,y,z is throwing me off.

Thank You, I was using the wrong energy.

Homework Statement It takes 208.4 kJ of energy to remove 1 mole of electrons from an atom on the surface of rubidium metal. What is the maximum wavelength of light capable of doing this? Homework Equations Ephotons=hc/lambda The Attempt at a Solution I don't know the energy of...

yea i thought there may be an equation, sry. A 10.2 g sample of CaCl2 is dissolved in 103 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the solution has a specific heat capacity of 4.18 J/°C·g...

How do you find the mass of a solution?