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3 years ago

Gold-198 has an atomic number of 79. it has __________ neutrons

Chemistry

2 answers:

Aleks04 [339]3 years ago

5 0

119 is the answer, if you'd subtract 198 to 79 you will get your result. hope this helped u ppl

gtnhenbr [62]3 years ago

5 0

Neutrons are the subatomic particles present in an atom having no charge i.e. neutral and mass of the neutron is approximately same as the mass of the proton.

Number of neutrons is equal to the subtraction of atomic mass and atomic number.

Number of neutrons = Atomic mass - atomic number

Atomic number of gold is 79 and atomic mass of gold is 198 amu.

Substitute the above value in formula, we get

Number of neutrons = $198-79$

= $119$

Thus, number of neutrons = $119$

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Sodium carbonate reacts with silver nitrate according to the following balanced equation: Na2CO3 (s) + 2 AgNO3 (aq) → Ag2CO3 (s)

klemol [59]

Answer:

a) 2.01 g

Explanation:

Na₂CO₃ (s) + 2AgNO₃ (aq) → Ag₂CO₃ (s) + 2NaNO₃

First we convert 0.0302 mol AgNO₃ to Na₂CO₃ moles, in order to calculate how many Na₂CO₃ moles reacted:

0.0302 mol AgNO₃ * $\frac{1molNa_2CO_3}{2molAgNO_3}$ = 0.0151 mol Na₂CO₃

So the remaining Na₂CO₃ moles are:

0.0340 - 0.0151 = 0.0189 moles Na₂CO₃

Finally we convert Na₂CO₃ moles into grams, using its molar mass:

0.0189 moles Na₂CO₃ * 106 g/mol = 2.003 g Na₂CO₃

The closest answer is option a).

8 0

3 years ago

Hydration of alkynes gives good yields of single compounds only with symmetrical or terminal alkynes. Draw the major organic pro

Alexxandr [17]

Answer:

Following are the solution to the given choice:

Explanation:

Hex-2-yne is just not alkyne symmetric, therefore two things respectively hexan-3-one and hexan-2-one are to be given.

The attached file it displayed the response along with the mechanism, please find the.

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3 years ago

Give the ground-state electron configuration for each of the following elements. After each atom is its atomic number in parenth

Anni [7]

Answer:

(a) ₁₉K: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

(b) ₁₀Ne: 1s² 2s² 2p⁶

---

(a) 3

(b) 6

Explanation:

We can state the ground-state electron configuration for each element following Aufbau's principle.

(a) ₁₉K: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

(b) ₁₀Ne: 1s² 2s² 2p⁶

Second part

(a) Al belongs to Group 13 in the Periodic Table. It has 13-10=3 electrons in the valence shell.

(b) O belongs to Group 16 in the Periodic Table. It has 16-10=6 electrons in the valence shell.

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3 years ago

Dose mass alone determine wether an object floats or sink

Semenov [28]

As the mass increases, the object is more likely to... As the volume increases, the object is more likely to... If an object has a density less than that of water, it will float. If an object has a density more than that of water, it will sink.

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3 years ago

What is nitrogen classified as

Fynjy0 [20]

Nitrogen is classified as a gas and a nonmetal.

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4 years ago