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what is the freezing point of solution made up of 54.9 g of NaCl dissolved in 800 g of water? (K_f_=1.86C/m)
Red phosphorus is fairly stable, while white phosphorus will ignite spontaneously in air above 50 C. Determine the change in entropy for the conversion of the white form to the red form
The material was used for thermal insulation in the 2003 Mars Exploration Rover. If the maximum space for insulation in the spacecraft's hull was 2294 cm3, what mass (in grams) did the aerogel insulation add to the spacecraft?
You need to produce a buffer solution that has a pH of 5.02. You already have a solution that contains 10 mmol (millimoles) of acetic acid. How many millimoles of acetate (the conjugate base of acetic acid) will you need to add to this solution? ..
the electron in the n=5 level of a hydrogen atom emits a photon with a wavelength of 1280 nm. To what energy level does the electron move?
If all four gases had initial concentrations of 0.650 M, calculate the equilibrium concentrations of the gases.
It takes 54.0 J to raise the temperature of an 11.7 g piece of unknown metal from 13.0C to 25.0C}. What is the specific heat for the metal?
Air coming from a painting operation contains 10.0 wt% acetone. The total flow rate of the air/acetone stream is 1.00x103 lbm/min. This stream is sent to a scrubbing system where it is mixed with water.
The pH of a bicarbonate-carbonic acid buffer is 8.00. Calculate the ratio of the concentration of carbonic acid (H2CO3) to that of the bicarbonate ion (HCO3-).
How many grams of methane gas (CH4) need to be combusted to produce 18.2 L water vapor at 1.2 atm and 275 K? CH4 (g) + 2 O2 (g)-> CO2 (g) + 2 H2O (g)
In the titrating vinegar expirment briefly explain if the following errors would result in high or low expermental determination of the molar concentration of ch3cooh
what is the molar concentration of the salt solution formed in this reaction? 3. what is the molar concentration of the excess reactant once this reaction has finished?
What is the lone pair?
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