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2 years ago

Information found on the periodic table for each element includes its atomic number, ___________, name, and atomic mass

Chemistry

1 answer:

Evgen [1.6K]2 years ago

5 0

Symbol. It is the element in an abbreviated way.

Example; Oxygen's symbol is O

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Name the fundamental unit involved in the derived unit joule?

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Answer:

Energy

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2 years ago

Convert 86,750,000,000 to scientific notation

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8.675 *10^10

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3 years ago

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Codeine C18H21NO3 is a weak organic base. A 5.0 x 10^-3 M solution of codeine has a pH of 9.95. Calculate the value of Kb for th

arsen [322]

Answer:

Kb = $4.45\times10^{-7}\ mol/L$

$p^{Kb}=6.35$

Explanation:

For a weak organic base, the formula to find $p^{OH}$ is given by:

$p^{OH}=p^{K_b}+\log c$

where c is the concentration of base.

Here c= $5\times10^{-3}\ M$

$p^{H}=9.95\\p^{OH}=14-p^{H}=14-9.95=4.05$

Substituting the above values in the formula,we get:

$p^{k_b}=p^{OH}-\log c\\p^{k_b}=4.05-\log (5\times10^{-3})\\p^{K_b}=6.35\\K_b=$antilog 6.35=4.45\times10^{-7}\ mol/L$

Hence:

Kb = $4.45\times10^{-7}\ mol/L$

$p^{Kb}=6.35$

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2 years ago

What is the mass percentage of oxygen in Ba3(PO4)2? Please help how do I go about figuring this out?

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Molecular Mass of Compound.

$\\ \sf\longmapsto Ba_3(PO_4)_2$

$\\ \sf\longmapsto 3(137u)+2(39u+4(16u))$

$\\ \sf\longmapsto 411u+2(39u+64u)$

$\\ \sf\longmapsto 411u+2(103u)$

$\\ \sf\longmapsto 411u+206u$

$\\ \sf\longmapsto 617u$

Molecular mass of O in compound=16(4)=64u

$\\ \sf\longmapsto Mass\%\:of\:O$

$\\ \sf\longmapsto \dfrac{64}{617}\times 100$

$\\ \sf\longmapsto \dfrac{6400}{617}$

$\\ \sf\longmapsto 10.3\%$

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2 years ago

Atoms of the LEAST reactive elements tend to have A. one or seven valence electrons. B. eight valence electrons. C. four or five

Tomtit [17]

B. eight valence electrons.

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3 years ago

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