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69.7 grams of a solute with a molecular mass of 2790 grams are dissolved in enough water to make 1.00 dm(3) of solution at 20 degrees C. What is the osmotic pressure of the solution?
The mechanism by which these compounds kill insects and people is unknown. D. These compounds kill insects and people by stimulating acetylcholinesterase, an enzyme of the nervous system.
A steel tank with a volume of 9.583 L contains N2 gas under a pressure of 4.972 atm at 31.8 °C. Calculate the number of moles of N2 in the tank.
A 4.50 g sample of NaOH at 25°C dissolves in 75.0 mL of water also at 25.0°C. The final equilibrium temperature of the mixture is 40.5°C. What is the enthalpy of solution, ?Hs, of NaOH expressed in kilojoules per mole
What is the percent purity of the calcium hydroxide if the titration requires 7.81 mL of the acid to reach the endpoint?
What will be the total volume of solution, in ml, when the concentration of 175.0 ml of 0.100 M K3PO4 solution is decreased to 0.012M
the gas sample weighs 2.62grams then computes the molecular weight and determines the identity of the gas.
How many moles of luminol are present in 2.00 L of the diluted spray?
What is the molality of a 25.5% aqueous solution of phosphoric acid, H3PO4 (M = 97.99 g/mol)
Write the systematic (IUPAC, or CA) names for the amines shown below. The names should have the format alkanamine.
What weight of malononitrile would be recovered by extraction with (a) three 100-mL portions of ether; (b) one 300-mL portion of ether.
A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 251{rm torr} . Pure pentane and hexane have vapor pressures of 425
Calculate the mass of water produced from 9.47g of methane, CH4, reacts with an excess of oxygen in the following unbalanced reaction. 2C8H18(g)+25O2(g)=16CO2(g)+18H2O(g)
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