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Drinking water is often cooled by evaporation from the surface of a cloth bag or clay pot. the heat cap of water 4.18 j/g C and >> delta heat vaporation = 40.67 kj/mol if tha heat capacity of the container is negligible , 1.8 g of water evaporating from the surface of the container will lower the temperature of 180 g of water inside the bag by how much Celsius?
what is the partial pressure of helium? If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure of argon?
What volume of 0.2500 M cobalt(III) sulfate is required to react completely with a) 25.00 mL of 0.0315 M calcium hydroxide?
question 1. a solution of 0.100 m acetic acid is prepared.a what is its ph value?b if 20 of the initial acetic acid is
If the pH of the solution is 5.4, calculate the molar concentration of H^ + (aq) in the solution.. In (M)
Ethanol is a common laboratory solvent and has a density of 0.789 g/mL
How many L of O2 gas at STP, are needed to react with 15.0 g of Na using the following chemical reaction: 2Na(s) + O2(g) => 2NaO(s)?
What is the rate constant? what would happen if you increase the concentration of NO by a factor of 1.9?
Starting with a 0.1 M solution and making a series of 1:100 dilutions, how many dilutions must you make to prepare a solution, that on average, has fewer than one molecule of solute per liter of solvent.
In the preparation of the esters given in this experiment, the reaction product was extracted with 5% sodium bicarbonate solution in the isolation step. Why? What gas was evolved during this washing step? Write a balanced equation for the reaction..
what is the density of a block of marble that occupies 306 cm3 and has a mass of 804 g? answer in units of g/cm3.
An organic compound has a molecular mass of 294.2 and contains 81.58% carbon by mass. How many carbon atoms are in each molecule of this compound
sodium acetate solution with 0.250MHCl, what will be the pH at the equivalence point? The Ka for acetic acid is 1.8x 10^-5
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