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Assume that a particular reaction evolves 245kJ of heat and that 24kJ of work is gained by the system what is the delta H inside and the surroundings
12.0 moles of gas are in a 8.00 L tank at 23.2 C. Calculate the difference in pressure between methane and an ideal gas under these conditions.
How many grams of liquid methanol (CH3OH) are needed to heat 425 mL of water from 18 oC to 43 oC by combustion with oxygen.
You have samples of approximately 8mL solution with ph ranging from 4 to 10. Calculate the volume of 1M HCIO4 needed to lower the ph to 2.5.
If a wave has a frequency of 6.9536 x 109 Hz and an energy of 4.6076 x 10-24 J, what is the speed of light.
What volume (L) of 0.250M HNO3 is required to neuralize a solution prepared by dissolving 17.5g NaOH in 350mL of water?
You are the Science Officer on the Starship Enterprise and you come across a new planet. You find that no light with wavelength less than about 650 nm reaches the surface of the planet.
Suppose we start with 0.0530 mol of N2O5 in a volume of 5.2 L. How many minutes will it take for the quantity of N2O5 to drop to 0.0253 mol?
Metal A was determined to be 95% extracted into methylene chloride with dethizone at pH6, when equal volumes of aqueous and non-aqueous solvents were used. what is the distribution ratio of A
A 155 mL sample of rainwater is titrated using 0.0095 M NaOH solution. If 4.8 mL of the NaOH solution was required to reach the endpoint, what was the pH of the rainwater?
If a 1.22 g piece of gold is hammered into a sheet whose area is 32.4 ft2, what is the average thickness of the sheet? (The density of gold is 19.32 g cm-3.)
Calculate the reaction Zn(s) + 2HCl(aq) ! ZnCl2(aq) + H2(g) What mass of ZnCl2 (MW = 136.3 g/mol) can be prepared from the reaction of 3.27 grams of zinc (MW = 65.38 g/mol) with 3.00 grams HCl (MW = 36.46)?
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? ..
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