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3 years ago

Nitrogen has an atomic mass of about 14 amu and an atomic number of 7. how many neutrons does nitrogen have?

Chemistry

2 answers:

madreJ [45]3 years ago

7 0

Answer:

The Nitrogen has 7 neutrons.

Explanation:

The Atomic Number is the number of protons of an atom and is represented by Z, so:

Z = number of protons

Z = 7

The Atomic Mass is the sum of the number of protons and the number of neutrons, and is represented by A, so:

A = number of protons + number of neutrons

A = 14

And from A we have that the number of neutrons is:

Number of neutrons = A - number of protons

Number of neutrons = A - Z

Number of neutrons = 14 - 7

Number of neutrons = 7

Finger [1]3 years ago

3 0

Nitrogen has 7 neutrons.

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1 year ago

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250 mL of a solution of calcium oxalate is the evaporated until only a residue of solid calcium

Lana71 [14]

Answer:

2.3 * 10^-5

Explanation:

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From the question;

1.2 * 10^-3 mols dissolves in 250 mL

x moles dissolves in 1000mL

x = 1.2 * 10^-3 mols * 1000/250

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CaC2O4(s) ------->Ca^2+(aq) + C2O4^2-(aq)

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2 years ago

2c+02=2CO2. The moles of co2 produced when 0.25 moles of O2 react is?

Sophie [7]

<h3>Answer:</h3>

$\displaystyle 0.5 \ mol \ CO_2$

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

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right<u> </u>

<u>Chemistry</u>

<u>Atomic Structure</u>

Moles
Compounds

<u>Stoichiometry</u>

Using Dimensional Analysis
Analyzing Reactions RxN

<h3>Explanation:</h3>

<u>Step 1: Define</u>

[RxN - Balanced] 2C + O₂ → 2CO₂

[Given] 0.25 moles O₂

[Solve] moles CO₂

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

[RxN] 1 mol O₂ → 2 mol CO₂

<u>Step 3: Stoichiometry</u>

[DA] Set up: $\displaystyle 0.25 \ moles \ O_2(\frac{2 \ mol \ CO_2}{1 \ mol \ O_2})$
[DA] Multiply/Divide [Cancel out units]: $\displaystyle 0.5 \ mol \ CO_2$

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2 years ago