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A red laser pointer emits light with a wavelength of 650 nm. A) What is the frequency of the light? B) What is the energy of 1.00 mole of these photons?
Calculate the pH of the solution made by adding 0.50 mol of propanoic acid, (C2H5COOH or HC3H5O2) and 0.30 mol of sodium propanoate (C2H5COONa or NaC3H5CO2) to 1.00 L of water. The value of Ka for C2H5COOH is 1.3 x 10^-5.
WHich of the following will act as a lewis acid? (please explain why as I need to understand the concept)
The concentration of the AlCl3 solution is Blank 1M. AlCl3 + 3AgNO3 ---> 3AgCl + Al(NO3)3 Write answer to three significant figures in decimal form(NOT in scientific notation)
calculate the mass of a sample of copper that occupies 4.2* 10^-3 cm^3 if the density of gold is 8.94 g/cm^3.
A scientist measures the standard enthalpy change for the following reaction to be -1053.4 kJ : 2H2S(g) + 3 O2(g) 2H2O(g) + 2 SO2(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of fo..
Assume that the volume of Earth's oceans is 137 x 10^7 km^3 and that the density of seawater is 1.03 g/cm^3. Also assume that the heat capacity of seawater is the same as that of water.
The molar heat capacity of silver is 25.35 J/Mol * degrees celcius. How much energy would it take to raise the temperature of 11.7g of silver by 16.9 degrees celcius?
An enzyme reduces the activation energy of a reaction at the temperature of 25 degree celsius from 55 kjmol-1 to 15kJ mol-1 by changing the route of the reaction.
For the borax solution at 48?C, no solid borax is present in the test tube. 5 millimeters is transferred to the corresponding calibrated test tube and subsequently titrated with the standardized hydrochloric acid solution.
Iron reacts with hydrochloric acid to produce iron (II) chloride and hydrogen gas. Fe(s) + 2 HCl(aq) -> FeCl2(aq) + H2(g) How many moles of HCl will react with 4.6 moles of Fe?
suppose 321 grams of methylamine (CH3NH2) and 332L of oxygen gas are mixed together in the reaction below at STP. how many grams of water should be prouduced?
How many moles of H3O+ or OH- must you add per liter of HA solution to adjust its pH from 9.45 to 9.02. Assume a neglible volume change
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