What is a surface that reflects a color of 500 nanometer wavelength?

Suppose a piece of silver jewelry contains 7.49x10^22 atoms of silver (Ag). how many moles of silver are in the jewelry?

zalisa [80]

Answer:

0.124 mol Ag

General Formulas and Concepts:

Atomic Structure

Moles

Stoichiometry

Using Dimensional Analysis

Explanation:

Step 1: Define

[Given] 7.49 × 10²² atoms Ag

[Solve] mol Ag

Step 2: Identify Conversions

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

Step 3: Convert

[DA] Set up: $\displaystyle 7.49 \cdot 10^{22} \ atoms \ Ag(\frac{1 \ mol \ Ag}{6.022 \cdot 10^{23} \ atoms \ Ag})$
[DA] Divide [Cancel out units]: $\displaystyle 0.124377 \ mol \ Ag$

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

0.124377 mol Ag ≈ 0.124 mol Ag

Topic: AP Chemistry

8 0

3 years ago

Explain why a magnesium atom is smaller than atoms of both sodium and calcium.

hodyreva [135]

In the periodic table, there is a size trend.
The trend occurs horizontally and vertically on the table.
- From right to left, the atomic radius gets larger.
- From top to bottom, the atomic radius gets larger.

The reasoning for this is the additional energy levels and electrons being added as you go from right to left or top to bottom.
We can see that Magnesium is higher and more right in the periodic table than sodium and calcium.
Thus, Magnesium has a smaller atomic radius than both sodium and calcium

5 0

3 years ago

Compare the radio waves broadcast by the two stations, WIL-92.3 and KSHE-94.7

tino4ka555 [31]

Answer:

there both radio stations

Explanation: there both radio stations

5 0

4 years ago

What is the primary source of gas for thick terrestrial planet atmospheres?

marishachu [46]

Outgassing from active volcanoes

7 0

4 years ago

Read 2 more answers

Question

AnnyKZ [126]

Blank #1: Polyatomic

Blank #2: 2 (see explanation)

Blank #3: 1 (see explanation)

<h3>Explanation</h3>

Both the ammonium ion $\text{NH}_4^{+}$ and the sulfate ion $\text{SO}_4^{2-}$ contain more than one atom in each ion. The two species are thus polyatomic. The chloride ion $\text{Cl}^{-}$ , for example, is monoatomic.

Superscripts above formulae of the ions indicate their charge. Each ammonium ion carries a positive one (+1) charge. Each sulfate ion carries a charge of negative two (-2).

Ammonium sulfate is an ionic compound. A sample of this compound contain myriads of ammonium ions and sulfate ions. The ions are packed in three-dimensional lattices. Thus unlike water, ammonium sulfate does not exist as molecules in nature.

Assuming that the second and third blanks refers to a formula unit, rather than a molecule, of ammonium sulfate. The empirical formula of ammonium sulfate gives the minimum whole-number ratio between the two ions in a sample.

Charges shall balance between the two ions. Ammonium ions are of charge +1. Sulfate ions are of charge -2. The sample shall thus contain two ammonium ions for every one sulfate ion.

The empirical formula of ammonium sulfate is therefore $(\text{NH}_4)_2\text{SO}_4$ .

There are thus two ammonium ions $\text{NH}_4^{+}$ and one sulfate ion $\text{SO}_4^{2-}$ in each formula unit of ammonium sulfate.

8 0

3 years ago