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Fantom [35]
3 years ago
13

Calculate the atomic mass of lead. The four lead isotopes have atomic masses and relative abundances of 203.973 amu (1.4%), 205.

974 amu (24.1%), 206.976 amu (22.1%) and 207.977 amu (52.4%).
Chemistry
1 answer:
blondinia [14]3 years ago
8 0
207.217 amu
Work:
203.973 amu *(0.014) = 2.855 amu
205.974 amu *(0.241) = 49.639 amu
206.976 amu *(0.221) = 45.741 amu
207.977 amu *(0.524) = 108.979 amu

2.855 + 49.639 + 45.741 + 108.979 = 207.217 amu
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Based on the three formulas shown, use one of them to solve for the purple yellow and red box and explain how you did it.
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P = 11.133 atm (purple)

T = -236.733 °C(yellow)

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<h3>Further explanation  </h3>

Some of the laws regarding gas, can apply to ideal gas (volume expansion does not occur when the gas is heated),:  

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\large {\boxed {\bold {PV = nRT}}}

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V = volume, liter  

n = number of moles  

R = gas constant = 0.08206 L.atm / mol K  

T = temperature, Kelvin  

To choose the formula used, we refer to the data provided

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T = 12 + 273.15 = 285.15 K

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\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{1.2\times 3.4}{0.08205\times 285.15}\\\\n=0.174~mol

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