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An avergae 70-kg adult human contains 170g of potassium. 0.0118% of naturally occuring potassium is potassium-40, which is a beta emitter with a half life of 1.28x109 years. What is the total activity (in counts per minute) of a human being, due solely to potassium-40?
How many reducing ends are in a molecule of corn starch (amylopectin) that contains 200,000 residues with a branch every 100 residues? Explain
What is the mass concentration of water vapor in the atmosphere at 25oC when the relative humidity is 60%and the saturation vapor pressure is 2800 Pa
All useless answers. Shouldn't lose points if answers are not helpful. A 0.4863-g sample of primary standard sodium carbonate (Na2CO3, fw 105.988) was treated with 40.00-mL of a dilute perchloric acid (HClO4, fw 100.458) solution.
the characteristic odor of pineapple is due to ethyl butyrate a compound containing carbon hydrogen and oxygen.
Determine the heat of combustion per gram of octane and the heat of combustion per mole of octane?
The phase diagram starts at 0K and gradually increases from 100k to 200k and as it hits 200K, the line splits apart increasing in pressure
What conclusion cab be drawn about the acid-base properties of EOxHy compounds and the position of the element E in the periodic table
Write the chemical equation(s), including state symbols, for what happens when the following ionic compounds are placed in water. Are these substances reacting with water when they are added to water
What mass of CO2 will be produced when 100.0 g of C8H18 react completely in the equation? 2C8H18 + 25O2 = 16CO2 + 18H2O
a solution of ammonia and water contains 3.20times1025 water molecules and 8.10times1024 ammonia molecules. how many
Which of the following reduces the solubility of calcium fluoride?
Iron metal is coated wih nickel. Which of metals will undergo corrosion when coating is damaged? Give the scheme of electrochemical corrosion and write equations for the reactions
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