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A 65 kg man is on ice skates. The skates blades have a total contact area of 2.0 cm^2. How much pressure does the man exert on the ice?
If 24g Mg is used the percentage yield is 95% how many gramns of magnesium hydroxide should be recovered? Write balanced equation for reaction.
A sample of gas confined in a 2.0L container at 930 Torr and 25oC was heated to 45oC. What was the final pressure?
a premature infant suffers from respiratory distress syndrome. compared to a normal infant, your patient will have- increased production of lactate by anaerobic glycolysis
Calculate the heat released when 25.0 g of water at 0 degrees C crystallizes to ice at the same temp. The specific heat of water is 1.00 cal/(g *degrees C); the heat of fusion is 80.0 cal/g and the heat of vaporization is 540.0 cal/g
A sample of h20 with a mass of 46.0 grams has a temperature of -58 degrees celcius. how many joules of energy are necessary to heat the steam from 100 degrees celsius to 114 degrees celcius.
The combustion of liquid ethanol (C2H5OH) produces carbon dioxide and water. Write a balanced equation for this reaction. After 4.2 mL of ethanol (density = 0.789 g/mL) was allowed to burn in the presence of excess oxygen gas. At the end of the proc..
A multivitamin tablet contains 40 milligrams of potassium. How many moles of potassium does each tablet contain?
Calculate the amount of energy that would be required to promote an electron from n=1 to n=100 in Li^2+
during lab you measured the ph of common household items. write net broslashnsted equations that show the acidic or
In the column chromatography portion of an experiment, a student uses different solvents or solvent mixtures to elute the column for separation of your product mixture.
When heat and a stream of H2 gas is applied to the sample, the Fe2O3 reacts to form metallic Fe and H2O(g). The Al2O3 does not react. If the sample residue weighs 2.499 g, what is the mass fraction of Fe2O3 in the original sample?
a solution contains a mixture of pentane and hexane at room temperature. the solution has a vapor pressure of 268 rm
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