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A small immersion heater is used to heat water for a cup of coffee. We wish to use it to heat 236 mL of water (about a teacupful) from 25 C to 78 C in 2 min. What must the heat rating of the heater, in kJ/min, to accomplish this? Ignore the heat that goes to the heat cup itself. The density of water is 0.997 g/ml.
They will dilute the 0.5 M solution to obtain 100 mL of 0.15M solution and dilute the 0.5m solution to obtain 10,000 ppm per mass. What is the molarity, molality, mass fraction and mole fraction
an aqueous solution of a nonelectrolyte boils at 100.32c. what is its expected freezing
How many grams of oxygen are needed to react completely with 1290 grams of pentanone (C5H10O)?
Consider the reaction, 2 D(g) + 3 E(g) + F(g) => 2 G(g) + H(g) When [F] is decreasing at 0.60 mol/Ls, how quickly is [G] increasing
Which of the following expressions is not equivalent to pH? a. log 1/[H+(aq)] b. 14.0-pOH c. -log [H+(aq)] d. -log Kw/[OH-] e
Estimate the solubility of silver iodide in pure water at 25 degrees Celsius (a) in moles per liter and (b) in grams per liter.
How fast must a 143.5 baseball travel in order to have a de broglie wavelength that is equal to that of an xray photon with landa = 79.0 pm
After heating, 37.19 grams of the anhydrous compound remained. What is the formula of the hydrate?
How many grams of NaNO2 form when 429 g NaNO3 react? The yield is 90.%.
a sample of sodium reacts completely with 0.213 of chlorine forming 351 of sodium chloride. what mass of sodium
The standard free energy change for the hydrolysis of ATP is -30.5 kJ. In a particular cell, the concentrations of ATP, ADP, and Pi are 2.8×10-3 M, 1.1×10-3 M, and 4.7×10-3 M, respectively. Calculate the free energy change for the hydrolysis of und..
Draw the following protein molecule, Need to draw the following molecule (using the lewis condensed line structure).
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