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4 years ago

Which is greater in positive acceleration, initial or final velocity

Chemistry

1 answer:

Alex17521 [72]4 years ago

6 0

inital velocity (u) should be less

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Number of atoms in 2.56 moles of He

bazaltina [42]

<h3>Answer:</h3>

1.54 × 10²⁴ atoms He

<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>

Moles
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>

[Given] 2.56 moles He

[Solve] atoms He

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

Avogadro's Number

<u>Step 3: Convert</u>

[DA] Set up: $\displaystyle 2.56 \ mol \ He(\frac{6.022 \cdot 10^{23} \ atoms \ He}{1 \ mol \ He})$
[DA] Multiply [Cancel out units]: $\displaystyle 1.54163 \cdot 10^{24} \ atoms \ He$

<u>Step 4: Check</u>

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

1.54163 × 10²⁴ atoms He ≈ 1.54 × 10²⁴ atoms He

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3 years ago