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A pure gold ring and pure silver ring have a total mass of 16.2 g. The two rings are heated to 64.8 C and dropped into 13.9 mL of water at 21.5 C. When equilibrium is reached, the temperature of the water is 23.5 C. Assume the density of 0.998 g/mL for the water. What is the mass of the gold ring?
MnO4-(aq) I-(aq)?Mn2 (aq) I2(s), the number of electrons gained in cathode is ( )
A 125 g aluminum block at an initial temperature of 95°C is dropped into a styrofoam flask containing 150 mL of water at 20°C. What is the final temperature?
Determine which structure do you expect to contribute the most to the actual structure of BrO 4 - keep in mind to take in expanded octets, as suitable?
What is the energy of a violet photon with wavelength 4.0 x 10^-7 m?
The student then took 100 ml of the Mg(OH)2 solution and reacted with HCl(aq). If 13.75 ml of .010M HCL reacted with the OH-(aq), what was the concentration of hydroxide ion in the 100ml solution?
Calculate the cost in free energy to move 1mol K+ through the cell wall by active transport. Assume no change in K+ concentrations during this process.
aluminum reacts with excess hydrochloric acid to form aqueous aluminum chloride and 36.8 ml of hydrogen gas over water
A 184-mg sample of Na2CO3 is dissolved in H2O to give 3.00L of solution. What is the concentration of Na+ in parts per million (ppm)?
Calculate the volume of concentrated sulfuric acid, containing 98% H2SO4 by mass, that would contain 40.0 g of pure H2SO4.
a solution that contains 55.0 g ascorbic acid vitamin c in 250 g of water freezes at - 2.34 oc. calculate the molar
oxygen molecules absorb uv radiation of wavelength less than and equal to 242 nm calculate the frequency and energy of the least energitic of these photons.
This precipitate is filtered off and a solution of NaOH is added to the supernatant liquid until it is strongly alkaline. No precipitate is formed.
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