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Calculate the total heat (in j) needed to convert 30.00 g of ice at -3.25 c to liquid water at 0.250 c: m.p. at 1 atm: 0.0 degrees c ^c liquid: 4.184 J/g x degrees c H fus: 6.02 kJ/mol c solid: 2.09 J/g x degrees c
What are the normal freezing points and boiling points of the following solutions? (a) 11.1 g NaCl in 172 mL of water (b) 11.7 g of urea in 66.4 mL of water
Aqueous hydrochloric acid reacts with zinc metal to yield hydrogen gas and aqueous zinc chloride. Write a net ionic equation for the process: 2 HCl(aq) + Zn(s) ? H2(g) + ZnCl2(aq)
A 1.00-L gas sample at 100.°C and 589 torr contains 50.0% helium and 50.0% xenon by mass. What are the partial pressures of the individual gases?
A solution is prepared by dissolving 294 g of sucrose (C12H22O11) in 624 g of water. What is the vapor pressure of this solution at 30°C? (The vapor pressure of water is 31.8 mmHg at 30°C.
Consider the voltaic cell below, which is symmetric except for the fact that [Cu2+] is 1.0 M on the left side and 0.01 M on the right. Which electrode is +, and what is Ecell?
A 4.78g sample of aluminum completely reacts with oxygen to form 6.67g of aluminum oxide. What is the mass percent composition of aluminum in aluminum oxide?
We place some solid Ca3(PO4)2 [Ksp = 5.14x10-33] in water. After reaching equilibrium, what is the pCa (=-log[Ca2+]) of the solution
we have a solution that contains 0.022 m ca2 and 0.014 m mg2. we will use potassium hydroxide to selectively
A 4.305-gram sample of a nonelectrolyte is dissolved in 105 grams of water. The solution freezes at -1.23°C. Calculate the molecular weight of the solute. Kf for water = 1.86°C/m.
Given the following equation, how many grams of PbCO3 will dissolve when 1.5L of 1.00 M H+ is added to 6.00g of PbCO3? PbCO3(s) + 2H^+(aq) = Pb^2+(aq)+ H2O (l)+ CO2(g)
A biochemist studying the break down of insecticide DDT finds that it decomposes by a first-order reaction w/ a half-life of 12 years. How long does it take DDT in the soil sample to decompose from 2.40 x10^2ppbm to 10. ppbm (parts per billion by ..
The energy levels the electron can occupy in the He^+ ion can be calculated using the energy level equation. Calculate the energy in kJ/mol of the electron when it is in the n=5 level. Energy level equation
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