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80.0 of is initially at room temperature (22.0). A chilled steel rod at 2.0 is placed in the water. If the final temperature of the system is 21.2, what is the mass of the steel bar?Specific heat of water = 4.18Specific heat of steel = 0.452
A copper wire with a mass of 4.32 g reacts with sulfur to form 5.41 g of a copper sulfide compound. a) Determine the number of moles of copper and sulfur in the compound. b) Determine the empirical formula of the product.
What is the molarity of the nitrate ions when 0.35 mol of barium nitrate, Ba(NO3)2, is dissolved in enough water to make 3.0 L of solution?
Write out the additional equations you would need to consider. d. Confirm that the number of equations is equal to the number of unknowns.
Water supply in a city is fluoridated by adding NaF. The preferred concentration of F- is 1.6ppm.calculate the amount of Naf in milligrams should be added per gallon (treated water) if the water supply is 0.2 ppm in F-?
A solution has a hydronium ion concentration of [H3O+] = 5.3 x 10^-4 Determine the pH of this solution.
a fishing boat accidentally spills 3.0 barrels of diesel oil into the ocean. each barrel contains 42 gallons. if the oil film on the ocean is 2.5 x 10^2nm thick , how many square meters will the oil slick cover?
If you wish to obtain 10.0 grams of copper metal from copper(II) sulfide, what mass of copper(II) sulfide (in grams) must you use?
Calculate the concentration of all ions present in each of the following solutions of strong electrolytes.(a) 0.0214 mol of sodium phosphate in 10.5 mL of solutionchemical concentration Mcation concentration Manion concentration
Calculate the work in Joules when 2.5 mols of water vaporizes at 1 atmosphere pressure and 25 degrees C. The work is done in pushing back the atmosphere.
Predict the delta H, delta S, delta V and delta G for dissolving 60. g benzene (C6H6) in 100. g of toluene (C7H8) at 298 K. State any assumptions made.
Consider a molecule with spacing between two energy levels of 0.250 kJ mol-1. Calculate the wavelength and wavenumber of the photon that would be needed to lead to an excitation between these two levels.
when 2.00 x 10 3 g of CaCo3 are heated the actual yield of Cao is 1.05 x 10 3 g. what is the percent yield?
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