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statuscvo [17]
2 years ago
14

A. How many protons, electrons, and neutrons make up an atom

Chemistry
1 answer:
mestny [16]2 years ago
5 0

Answer:

45 neutrons

Explanation:

Bromine has 35 protons and a mass number of 80. a) How many neutrons does the atom of bromine have? The mass number = protons + neutrons. Bromine has a mass number of 80 and 35 protons so 80-35 = 45 neutrons.

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one reaction that produces hydrogen gas can be represented by the unbalanced chemical equation Mg(s)+HCI(aq) -> MgCI(aq)+H2(g
Sonbull [250]
<h3>Answer:</h3>

128 g HCl

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right<u> </u>

<u>Chemistry</u>

<u>Atomic Structure</u>

  • Reading a Periodic Table

<u>Stoichiometry</u>

  • Reaction Mole Ratios
  • Using Dimensional Analysis
<h3>Explanation:</h3>

<u>Step 1: Define</u>

[RxN - Unbalanced] Mg (s) + HCl (aq) → MgCl (aq) + H₂ (g)

↓

[RxN - Balanced] 2Mg (s) + 2HCl (aq) → 2MgCl (aq) + H₂ (g)

[Given] 3.25 mol Mg

[Solve] x g HCl

<u>Step 2: Identify Conversions</u>

[RxN] 2 mol Mg → 2 mol HCl

[PT] Molar Mass of H - 1.01 g/mol

[PT] Molar Mass of Cl - 35.45 g/mol

Molar Mass of HCl - 1.01 + 35.45 = 36.46 g/mol

<u>Step 3: Stoich</u>

  1. [S - DA] Set up:                                                                                                 \displaystyle 3.25 \ mol \ Mg(\frac{2 \ mol \ HCl}{2 \ mol \ Mg})(\frac{36.46 \ g \ HCl}{1 \ mol \ HCl})
  2. [S - DA] Multiply/Divide [Cancel out units]:                                                    \displaystyle 127.61 \ g \ HCl

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 3 sig figs.</em>

127.61 g HCl ≈ 128 g HCl

3 0
2 years ago
Pollutants may be natural or man-made true or false​
enyata [817]

Answer:

It's <em>True</em> very true darling

4 0
2 years ago
Read 2 more answers
When a car takes a sharp turn to the left and the person in the car slides to the right, this
balu736 [363]

Answer:

It is newtons First Law:)

Explanation:

6 0
2 years ago
If I know the number of neutrons in an element do I know what element it is ?
Phoenix [80]

Answer:

No.

Explanation:

You the atomic number indicates element. The atomic number is derived from the amount of protons, not neutrons. So you could have 198 neutrons and not know that its gold because it is the isotope gold 198.

4 0
3 years ago
Calculate the pH of a buffer solution made by adding 15.0 g anhydrous sodium acetate (NaC2H3O2) to 100.0 mL of 0.200 M acetic ac
DiKsa [7]

Answer:

pH of Buffer Solution 5.69

Explanation:

Mole of anhydrous sodium acetate = \frac{Given mass}{Molecular mass}

                                                           = \frac{15}{82}

                                                           = 0.18 mole

 100 ml of 0.2 molar acetic acid  means

= M x V

= 0.2 x 100

= 20 mmol

= 0.02 mole

Using Henderson equation to find pH of Buffer solution

pH = pKa + log\frac{[Salt]}{[Acid]}

     = 4.74 + log\frac{0.18}{0.02}

     = 4.74 + log 9

     = 5.69

So pH of the Buffer solution = 5.69

8 0
3 years ago
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