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Elis [28]
3 years ago
11

An atom of gold (Au) has 79 electrons. How many protons must it have if it has a net charge of 0?

Chemistry
2 answers:
Varvara68 [4.7K]3 years ago
6 0
In order to balance out the Electrons, and give it a net charge of 0, you would need 79 Protons.
RoseWind [281]3 years ago
5 0

Explanation:

It is known that for a neutral atom the number of protons present in that atom is equal to the number of electrons present in it.

Also, atomic number means the sum of total number of protons present in an atom.

For example, when a gold atom has net charge 0 then it means it is neutral in nature.

Also, it contains 79 electrons. This also means it contains 79 protons.

Thus, we can conclude that an atom of gold (Au) which has 79 electrons will also contain 79 protons.

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Explanation:

A= Delta v/ delta t

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The amount of matter in an object is called
marta [7]

Answer: Matter

Explanation:

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7 0
3 years ago
When 0.5141 g of biphenyl (C12H10) undergoes combustion in a bomb calorimeter, the temperature rises from 25.823 °C to 29.419 °C
natka813 [3]

Answer:

\Delta_{r}U of the reaction is -6313 kJ/mol

\Delta_{r}H of the reaction is -6312 kJ/mol

Explanation:

Temperature\,\,change= \Delta U = 29.419-25.823 =3.506^{o}C

q_{cal}= C \times \Delta T

=5.861 \times 3.596 = 21.076\,kJ

q_{rxn}= -q_{cal}= -21.076\,kJ

\Delta_{r}U= -21.076 \times \frac{154}{0.5141}= -6313\, kJ/mol

Therefore, \Delta_{r}U of the reaction is -6313 kJ/mol.

The chemical reaction in bomb calorimeter  is as follows.

C_{12}H_{10}(s)+\frac{27}{2}O_{2}(g)\rightarrow 12CO_{2}(g)+5H_{2}O(g)

Number\,of\,moles\Delta n=(12+5)-\frac{27}{2}=3.5

\Delta_{r}H=\Delta E+ \Delta n. RT

=-6313+3.5\times 8.314\times 10^{-3} \times 3.596=-6312\,kJ/mol

Therefore, \Delta_{r}H of the reaction is -6312 kJ/mol.

3 0
3 years ago
A ring costs $36 more than a bracelet. the cost of the bracelet is 4/7 the cost of the ring. find the total of the two items.
avanturin [10]
So let's use some equations to represent the data [let R= cost of ring & B= cost of bracelet]

R= B + $ 36 .... (1)

B= \frac{4}{7} × R ... (2)

By using simultaneous equations to solve for B and R.
Substitute eq. (1) into eq. (2)

      B =  \frac{4}{7} × (B + $36)

      B = \frac{4}{7}B + \frac{144}{7}

     ( \frac{7}{7}  -  \frac{4}{7} ) B =  \frac{144}{7}

     \frac{3}{7} B =   \frac{144}{7}

⇒  B = $48

By substituting value of B into ea (1)

If R = B + $36
   
   R = ($48) + $36
     
      = $84

∴  <span> the total of the two items = R + B
                                             = $84 + $48
</span>                                             = $132

7 0
3 years ago
A gas occupies a volume of 0.20 L at 25 kPa. What volume will the gas occupy at 2.0 kPa?
ycow [4]

Answer:

2  L

Explanation:

5 0
2 years ago
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