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andreev551 [17]
3 years ago
11

675 g of carbon tetrabromide is equivalent to how many

Chemistry
2 answers:
sertanlavr [38]3 years ago
8 0

Answer:

\boxed {\boxed {\sf About \ 2.04 \ moles \ of \ CBr_4}}

Explanation:

1. Define Formula

The compound is carbon tetrabromide. The tetra indicates 4 atoms of bromine.

  • Carbon (C)+ 4 Bromine (Br) = CBr₄

2. Find Molar Mass

There are 2 elements in this compound: carbon and bromine. Use the Periodic Table to find the molar masses of these elements.

  • Carbon (C): 12.011 g/mol
  • Bromine (Br): 79.90 g/mol

The molar mass is based on the number of atoms in the compound. The compound has 1 atom of carbon and 4 atoms of bromine.

CBr₄= 1(12.011 g/mol) + 4(79.90 g/mol)

= 12.011 g/mol+319.60 g/mol = 331.611 g/mol

3. Convert Grams to Moles

We want to convert 675 grams to moles. We should use the molar mass as a fraction.

\frac{331.611 \ g \ CBr_4}{1 \ mol \ CBr_4 }

Multiply by the given number of grams.

675 \ g \ CBr_4 *\frac{331.611 \ g \ CBr_4}{1 \ mol \ CBr_4 }

Flip the fraction so the grams of CBr₄ will cancel.

675 \ g \ CBr_4 *\frac{1 \ mol \ CBr_4 }{331.611 \ g \ CBr_4}= 675 \  *\frac{1 \ mol \ CBr_4 }{331.611 \ }

\frac{675 \ mol \ CBr_4 }{331.611 \ } = 2.03551752 \ mol \ CBr_4

4.Round

The original measurement, 675 grams has 3 significant figures (6,7 and 5), so our answer must have the same.

For the answer we found, 3 sig figs is the hundredth place.

2.03551752 \ mol \ CBr_4

The 5 in the thousandth place tells us to round the 3 to a 4.

\approx 2.04 \ mol \ CBr_4

There are about <u>2.04 moles </u>of carbon tetrabromide in 675 grams.

VARVARA [1.3K]3 years ago
7 0
<h3>Answer:</h3>

2.04 mol CBr₄

<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>Chemistry</u>

<u>Organic</u>

  • Writing Organic Compounds
  • Writing Covalent Compounds
  • Organic Prefixes

<u>Atomic Structure</u>

  • Reading a Periodic Table
  • Using Dimensional Analysis
<h3>Explanation:</h3>

<u>Step 1: Define</u>

675 g CBr₄

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

Molar Mass of C - 12.01 g/mol

Molar Mass of Br - 79.90 g/mol

Molar Mass of CBr₄ - 12.01 + 4(79.90) = 331.61 g/mol

<u>Step 3: Convert</u>

<u />\displaystyle 675 \ g \ CBr_4(\frac{1 \ mol \ CBr_4}{331.61 \ g \ CBr_4}) = 2.03552 \ mol \ CBr_4<u />

<u />

<u>Step 4: Check</u>

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

2.03552 mol CBr₄ ≈ 2.04 mol CBr₄

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