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DanielleElmas [232]
3 years ago
5

Who arranged the periodic table according to atomic mass

Chemistry
1 answer:
lozanna [386]3 years ago
3 0

Answer:

Dmitri Mendleev in 1869.

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2 years ago
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7. If a waste container has 87.0 mL of 0.234 M acetic acid, how many milliliters of 2.00 M sodium
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Answer:

V_{base}=10.2mL

Explanation:

Hello.

In this case, since the neutralization of the acid requires equal number of moles of both acid and base:

n_{acid}=n_{base}

Whereas we can express it in terms of concentrations and volumes:

M_{acid}V_{acid}=M_{base}V_{base}

Thus, we can compute the volume of sodium hydroxide (base) as follows:

V_{base}=\frac{M_{acid}V_{acid}}{M_{base}} \\\\V_{base}=\frac{87.0mL*0.234M}{2.00M}\\ \\V_{base}=10.2mL

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3 years ago
It is found that the new element contains 74 protons and 110 neutrons. What is the atomic number of the element
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74

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atomic number = number of protons

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atomic number = 74

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