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3 years ago

15

How many moles of atoms are in 45.0g of gold

2 answers:

Inessa05 [86]3 years ago

6 0

Hello!

$45.0g \: au \times \frac{1 \: mol \: au}{196.97 \: g \: au} \: = 0.228 \: mol \: au$

And there's your answer! ^ I really hope this helped you out! :)

DiKsa [7]3 years ago

3 0

Hi how are nice to meet you

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Write the electrons configuration for an atom of an element whose atomic number is 8

Basile [38]

The electron configuration for a atom whose element has a atomic number of 8 (Oxygen) is 2,6

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3 years ago

A student is adding DI water to a volumetric flask to make a 50% solution. Unfortunately, he was not paying attention and filled

dalvyx [7]

Answer:

His results will be skewed because there was more water than stock solution. Which would cause the percentage solution to be less than 50% therefore the density would be less than the actual value.

Explanation:

The solution will have percentage less than that of 50%. Therefore the density would be less than the actual value.

Suppose there should be 50 mL of the solution, and he added 60 mL. So 10 mL of the solution is added more.

Suppose the mass of the solute is m.

Originally, the density is = $\frac{m}{50}$ $\left(\frac{\text{mass}}{\text{volume}}\right)$

Now after adding extra 10 mL , the density becomes $\frac{m}{60}$ .

Therefore, $\frac{m}{50}>\frac{m}{60}$

So the density decreases when we add more solution.

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3 years ago

40o+2 protons electrons And neurons

KatRina [158]

Answer: There are few simple rules to follow.

(1) The atomic number is equal to the number of protons.

Z

= number of protons

(2) In neutrally charged elements, the number of electrons is the same as the number of protons.

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= number of protons = number of electrons (no charge)

Otherwise, positive charge means that the element lost an electron and negative charge means it gained an electron.

(3) The atomic mass is equal to the sum of the number of protons and number of neutrons.

A

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or

A

=

Z

+ number neutrons

So if you say that

Z

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=

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40 = 20 + number of neutrons

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3 years ago

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Inessa [10]

Answer: Final temperature of the gas will be 330 K.

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where,

$P_1$ = initial pressure of gas = 1.00 atm

$P_2$ = final pressure of gas = 1.13 atm

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$T_2$ = final temperature of gas = ?

${1.00\times 373}={1.13\times T_2}$

$T_2=330K$

Therefore, the final temperature of the gas will be 330 K.

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Thepotemich [5.8K]

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3 years ago

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