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An alloy of iron contains 75.0% iron and 25.0% other elements. How many grams of iron are present in 150. g of the alloy?
Consider the reaction 2NH3 + CH3OH → products .How much NH3 is needed to react exactly with 21 grams of CH3OH?
a 97 gram solution of silver nitrate contains 21 grams of AgNO3. what is the percent by mass of silver nitrate in this solution?
Show your calculations and determine the half-life of Tc-99 (in hours). (b)The delivery of a sample of Tc-99 from the reactor to the nuclear medicine lab of the hospital takes 3h.
Calculate the molarity of an NH3 solution made up of 37.5 g of NH3 in 70.0 g of water. The density of the solution is 0.982 g/mL
A 2.00-g sample of white solid was vaporized in a 345-mL vessel. If the vapor has a pressure of 985 mmHg at 158°C, what is the molecular mass of the solid?
Ephedrine was once used in diet pills that could be purchased without a prescription. Ephedrine is composed of 72.7% C, 9.15% H, 8.49% N, and 9.68% O.
Subtract one from the other. In what direction do the functions point? What orbitals are "left" unused on the C atom?
How many milliliters of a stock solution of 10.0 M HNO_3 would you have to use to prepare 0.320 L of 0.550 M HNO_3?
Calculate the freezing point of a solution that contains 8.0 g of sucrose (C12H22O11) in 100. g of H2O. Kf for H2O = 1.86
The temperature remains unchanged. Determine the final pressure of the system of two tanks.
A 0.221 g pellet of potassium hydroxide,KOH, is added to 52.2 g water in a Styrofoam coffee cup. The water temperature rises from 23.5 to 24.4 °C.
The glass electrode used in commercial pH meters gives an electrical response proportional to the concentration of hydrogen ion. To convert these responses to a pH reading
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