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Iridium-192 has a half-life of 74 days. What fraction of a sample of this isotope will remain after 222 days?
How much heat in kilocalories is required to melt 1.70 mol of isopropyl alcohol ? The heat of fusion and her of vaporization of isopropyl
Ammonia reacts with diatomic oxygen to form nitric oxide and watervapor. When 40.0g of ammonia and 50.0 g of oxygen are mixed and allowed to react, which is the limiting reagant? 4NH3 +5O2--> 4NO + 6H2O
When determining the pressure of dry hydrogen gas, explain how the measured atmospheric pressure is corrected for the presence
Calculate the percent by weight, mole fraction and mole percent of each component in a mixture consisting 9g of water (H2O), 120g acetic acid(CH3COOH) and 115g of ethyl alcohol (C2H5OH).
A 98 L sample of dry air cools from 138°C to -30.°C while the pressure is maintained at 2.85 atm. What is the final volume?
How many grams of aluminum oxide are produced when 50.3g aluminum react, When 0.510 mole aluminum is reacted in a closed container with 7.90g oxygen, how many grams of aluminum oxide can form?
When atoms of the hypothetical element X are placed together, they rapidly undergo reaction to form the X2 molecule. Would you predict that this reaction is exothermic or endothermic?
An allosteric enzyme that follws the concerted mechanism (MWC model) has T/R ratio of 300 in the absence of substrate. Suppose that a mutation reversed the ratio.
What volume does the beaker hold? Use d =1.00 g/mL as the density of water answer in mL B)How much would the beaker and its contents weigh if it was completely filled with mercury?
Compute the boiling point elevation of a salt water solution that contains 5.90 g of NaCl dissolved in 109 ml of water. Enter the number of degrees celsius that the boiling point will be elevated.
A helium nucleus has two protons and two neutrons. How many electrons would it take to equal the mass
Calculate the change in temperature for 1.30 g of CaCl2 dissolved in 25.0mL of H2O. Assume that the calorimeter absorbs no heat.
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