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CaHeK987 [17]
3 years ago
12

Atomic number describes which of the following?

Chemistry
2 answers:
Burka [1]3 years ago
8 0

Answer:

The correct answer is option C.

Explanation:

Atomic weight is defined as sum of protons and neutrons present in the nucleus of an atom of the particular element.It is denoted by A.

Atomic number is defined as total number of protons present in the nucleus of an atom of the particular element. It is denoted by Z.

For an element say with X symbol both atomic weight and number are denoted by: ^{Z}_{A}X.

masha68 [24]3 years ago
6 0
The answer is D hope this helps
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The half life for the first order conversion of A to B is 56.6 hours. How long does it take for the concentration of A to decrea
sveta [45]

Answer:

It will take 188.06 hours for the concentration of A to decrease 10.0% of its original concentration.

Explanation:

A → B

Initial concentration of the reactant = x

Final concentration of reactant = 10% of x = 0.1 x

Time taken by the sample, t = ?

Formula used :

A=A_o\times e^{-\lambda t}\\\\\lambda =\frac{0.693}{t_{\frac{1}{2}}}

where,

A_o = initial concentration of reactant

A = concentration of reactant left after the time, (t)

t_{\frac{1}{2}} = half life of the first order conversion  = 56.6 hour

\lambda = rate constant

A=A_o\times e^{-(\frac{0.693}{t_{1/2}})\times t}

Now put all the given values in this formula, we get

0.1x=x\times e^{-(\frac{0.693}{56.6 hour})\times t}

t = 188.06 hour

It will take 188.06 hours for the concentration of A to decrease 10.0% of its original concentration.

4 0
3 years ago
The atmospheric pressure on the surface of Venus is 6.84X10^4. Calculate the atmospheric pressure in atm and torr. Round each of
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Answer:

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513 Torr

Explanation:

Given is that, the atmospheric pressure on the surface of Venus is

6.84 X 10⁴ Pa.

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To convert divide the pressure value by 101325.

Pressure in atm = \frac{6.84 \times 10^{4} }{101325}

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Rounding it off to 3 significant digits: 0.675 atm

Now,  one Torr is 133.322 Pa. For conversion, divide the pressure value by 133.322.

Pressure in Torr = \frac{6.84 \times 10^{4} }{133.322}

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Rounding it off to 3 significant digits: 513 Torr

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Explanation:

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Answer:

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Explanation:

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