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3 years ago

How many protons, neutrons and electrons are in these atoms?

Chemistry

1 answer:

storchak [24]3 years ago

7 0

Answer:

A. Proton = 6

Neutron = 7

Electron = 6

B. Proton = 56

Neutron = 74

Electron = 56

C. Proton = 92

Neutron = 140

Electron = 92

Explanation:

A. Mass number = 13

Atomic number = 6

Proton = Atomic number = 6

Since the element has no charge,

Electron = proton = 6

Mass number = proton + Neutron

Neutron = Mass number — proton

Neutron = 13 — 6 = 7

B. Mass number = 130

Atomic number = 56

Proton = Atomic number = 56

Since the element has no charge,

Electron = proton = 56

Mass number = proton + Neutron

Neutron = Mass number — proton

Neutron = 130 — 56 = 74

C. Mass number = 232

Atomic number = 92

Proton = Atomic number = 92

Since the element has no charge,

Electron = proton = 92

Mass number = proton + Neutron

Neutron = Mass number — proton

Neutron = 232 — 92= 140

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Fe(II) can be precipitated from a slightly basic aqueous solution by bubbling oxygen through the solution, which converts Fe(II)

vovangra [49]

Answer:

0,051g of O₂

Explanation:

The reaction of precipitation of Fe is:

4Fe(OH)⁺(aq) + 4OH⁻(aq) + O₂(g) + 2H₂O(l) → 4Fe(OH)₃(s)

-Where the Fe(OH)⁺ is Fe(II) and Fe(OH)₃ is Fe(III)-

This reaction is showing you need 1 mol of O₂(g) per 4 moles of Fe(II) for a complete reaction.

85mL= 0,085L of 0,075M Fe(II) are:

0,085L*0,075M = 6,34x10⁻³ moles of Fe(II)

For a complete reaction of 6,34x10⁻³ moles of Fe(II) you need:

6,34x10⁻³ moles of Fe(II)× $\frac{1molO_2}{4moles Fe(II)}$ =

1.59x10⁻³ moles of O₂. In grams:

1.59x10⁻³ moles of O₂× $\frac{32g}{1molO_2}$ = 0,051g of O₂

I hope it helps!

7 0

2 years ago

2. What is the molarity of a HCl solution containing 1.2 grams of hydrochloric acid in 0.025 L of solution?

alisha [4.7K]

Answer:

1.3M

Explanation:

Convert from grams to moles:

molar mass of HCl = 1.01g(molar mass of H) + 35.45g(molar mass of Cl) = 36.46g HCl

1.2g HCl (1mol HCl/36.46g HCl)

= .0329 mol HCl

Molarity = mol/L (important formula for concentration)

Plug your values in:

Molarity = .0329mol/.025L

1.317M - but you used two significant figures in the question, so:

1.3M

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3 years ago

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19. Which of the following best describes the role of the spark from the spark plug in an automobile engine?

sergey [27]

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Explanation:

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An electrical device that fits into the cylinder head and ignites compressed aerosol gasoline by an electric spark. They have an insulated electrode connected to a coil that ignites thereby producing sparks.
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3 years ago