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A student determines the molar mass of methanol. She found that the equilibrium temperature of a mixture of ice and pure water was 0.4 degrees C on her thermometer. When she added 10.0 g of her sample to the mixture, the temperature, after thorough stirring, fell to -5.4 degrees C. She then poured off the solution through a screen into a beaker. The mass of the solution was 101.8g. How much methanol was in the decanted solution? How much water was in the decanted solution?
Presence of Aldehyde Group, An excellent way to identify the presence of an aldehyde group is by 1H NMR. The chemical shift of the aldehydic proton occurs in the 9-10-ppm region
How much ice(in grams) would have to melt to lower the temperature 352ml of water from 25degrees celcus to 5 degrees celcus? ( assume the density of water is 1.0g/ml)
Which is the stronger base, HSO4- or H2O? b. Which is the stronger base, H2O or OCl-?
a dry gas, held at a constant temperature, occupies a volume of 24.8 mL at 725 torr. What will be the volume of the gas at 800 torr
Propane is often used for gas grills and is typically purchased by filling a propane tank with 20 pounds of propane. What is the enthalpy change when 18 pound of propane is burned?
If 17.2 mL of 0.800 M hydrochloric acid solution are required to neutralize 5.00 mL of a household NH3 solution, determine the molar concentration of the NH3,ammonia?
calculate the number of moles of He gas is present in a 1500ml balloon at a pressure of 640 torr and temperature of 25 degrees Celsius?
How many grams of methane [CH4(g)] must be combusted to heat 1.00 kg of water from 25.0°C to 90.0°C, assuming H2O(l) as a product and 100% efficiency in heat transfer?
What is the molarity of your NaOH solution? 2) You are given an impure sample of oxalic acid dihydrate (MW=126.068 g/mole) and asked to determine the percent of oxalic acid dihydrate present in the sample.
Determine how many moles of SO 3 are formed if 12.24 moles of O 2 react with excess SO 2 ,? use the balance equation given as 2SO 2 (g)+O 2 (g)----> 2SO 3 (g)
how much heat energy in calories is needed to raise the temperture 10.0g of water 6.0C
What is the change in pH when 0.005 moles of HCl is added to 0.100 L of a buffer solution that is 0.100 M in CH3CO2H and 0.100 M NaCH3CO2? The Ka for acetic acid is 1.8 x 10 -5.
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