All fossil fuels contain this element. iron hydrogen copper magnesium

Chemistry

2 answers:

IrinaVladis [17]2 years ago

6 0

B)Hydrogen is the answer.......

Rama09 [41]2 years ago

5 0

<h2>Answer : Option B) Hydrogen</h2><h3>Explanation :</h3>

All fossil fuels contains hydrocarbons in it. Amongst the given options hydrogen is the correct answer. Except that it contains carbon in it. Hydrocarbons are those class of compounds which contains hydrogen and carbon as element in it.

They are considered to be good fuels because they naturally bring out complete combustion as they contain hydrogen and carbon in its compound form.

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How many moles of Ca are in 3.75 x 10^25 atoms of Ca?

ioda

<h3>Answer:</h3>

62.3 mol Ca

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

<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>

Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<u>Stoichiometry</u>

Using Dimensional Analysis

<h3>Explanation:</h3>

<u>Step 1: Define</u>

3.75 × 10²⁵ atoms Ca

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

Avogadro's Number

<u>Step 3: Convert</u>

Set up: $\displaystyle 3.75 \cdot 10^{25} \ atoms \ Ca(\frac{1 \ mol \ Ca}{6.022 \cdot 10^{23} \ atoms \ Ca})$
Multiply/Divide: $\displaystyle 62.2717 \ mol \ Ca$