Answer:
Uranium-238 or lead-206 are most often used to date rocks. ... Carbon-14's half-life is much too long to use for dating rocks. C) The half life of carbon-14 is about 5700 years and is too short date rocks. D) Carbon-14 is only found in living things; it can only be used to date remains
Explanation:
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Kf = 1.86
Number of moles :
Molar mass <span> ethylene glycol = 62.0 g/mol
40.0 / 62.0 => 0.645 moles
Molality :
mass of solvent = 60.0 / 1000 => 0.06 kg
m = moles / kg solvent
m = </span><span>0.645 / 0.06
= 10.75 m
</span>Δt = Kf x molality
Δt = (- 1.86) x 10.75 => - 20.1ºC
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Answer A
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Answer:
m = 176.04 g .
Explanation:
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In this case, according to the mole-mass relationships, which are based off the mass of one mole of any compound via the molar mass, it is possible to realize that the molar mass of carbon dioxide is 44.01 (12.01+16*2) g/mol, and therefore, the mass in grams of 4.00 moles of this compound are calculated as shown below:
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D. there would be a proportional increase in pressure to temperature