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Kisachek [45]
1 year ago
7

Select the correct answer. if two half-lives have passed since a scientist collected a 1.00-gram sample of u-235, how much u-235

is left now? a. 0.001 g b. 0.100 g c. 0.250 g d. 0.450 g e. 3.00 g
Chemistry
1 answer:
Ugo [173]1 year ago
3 0

Answer:

0.25 g of U-235 isotope will left .

Formula used :

where,

N = amount of U-235 left after n-half lives = ?

= Initial amount of the U-235 = 1.00 g

n = number of half lives passed = 2

0.25 g of U-235 isotope will left .

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<u>2.37</u> is the pH of 0.075 M HZ.

<h3>What is pH?</h3>

The term pH, which originally stood for "potential of hydrogen" (or "power of hydrogen"), is used in chemistry to describe how acidic or basic an aqueous solution is. Lower pH values are summarized for acidic solutions (solutions with higher H+ ion concentrations) than for basic or alkaline solutions.

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1 year ago
Copper has two naturally occurring isotopes. Cu−63 has a mass of 62.939 amu and relative abundance of 69.17%.
fiasKO [112]
The answer is 64.907 amu.

The atomic mass of an element is the average of the atomic masses of its isotopes. The relative abundance of isotopes must be taken into consideration, therefore:
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We know:
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Answer:

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bogdanovich [222]

Answer:

\boxed{\text{pH = 5.00}}

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