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3 years ago

Determine the percent composition of sodium in sodium carbonate

Chemistry

1 answer:

crimeas [40]3 years ago

3 0

11×2=22
(11×2)+(6)+(8×3)=52
22/52=0.4230
0.4230×100=42.3%

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2 years ago

How many moles are in 2.8x10^24 atoms of silicon?

sergejj [24]

Answer:

4.6 mol Si

General Formulas and Concepts:

Atomic Structure

Reading a Periodic Table
Moles
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Stoichiometry

Using Dimensional Analysis

Explanation:

Step 1: Define

[Given] 2.8 × 10²⁴ atoms Si

[Solve] moles Si

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

[DA] Set up: $\displaystyle 2.8 \cdot 10^{24} \ atoms \ Si(\frac{1 \ mol \ Si}{6.022 \cdot 10^{23} \ atoms \ Si})$
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Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

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