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A rock was recently discovered near the arctic circle (just a little east of Barrow, Alaska) which was found to contain 1.0239 nanograms (ng) of 206Pb and 2.6556 ng of 238U. The decay series of 238U to 206Pb is a process which has a half-life of 4.50x109 years. We assume the first step in this decay series is, by far, the slowest and that all the 206Pb found in the sample is derived from this decay process. How old (in billions of years, where 1 billion = 109) is the rock
If a bottle of nail polish remover contains 172 of acetone,how much heat would be released by its complete combustion? The density of acetone is 0.788 .
calorimetry can be used to find heats of combustion. suppose a calorimeter helps someone to determine that 4032 kj of heat is released during the combustion of 88.0 grams of propane, C3H8 (44.0 g/mol).
7.41g of O2 are combined with 5.23g NH3 , and the reaction proceeds. What mass of NO is produced?
Two moles of a monoatomic gas are contained atpressure 1 atm and teperature 300 k. 34, 166 joules of heat are transfered to the gas as a result the gas expands and does work on the surroundings of 1214 joules.
Which of the following elements will have the same number of core electrons as P?
Calculate the heat required to raise the temperature of 125 g of water are heated from 20.0oC to 100oC based on a specific heat of water of 4.184 J/g oC.
A biochemist is trying to purify the enzyme hexokinase from a bacterium that normally grows in the Arctic Ocean at 5C. In the next lab
If the final tempurature of the combined water is 42.0 degrees C and the heat capacity of the calorimeter is 26.3 J/degrees C , calculate the mass of the water originally in the calorimeter
If 3.93 g of sodium borohydride contains 2.5 × 10e23 H atoms, how many moles of H are present in 33 cm3 of sodium borohydride (of density 1.074 g/cm3)?
Calculate the amount of heat liberated (in kJ) from 437 g of mercury when it cools from 61.0°C to 12.0°C.
Discuss how precise and accurate measurement can be achieved in spite of the inherent measurement uncertainty. Take a ruler and measure the height of the textbook three times. Record the three measurements, and discuss the uncertainty in your meas..
how many grams of MgCl2 are contained in 225mL of a 0.650 M solution
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