<h3>
Answer:</h3>
28 mol CaF
<h3>
General Formulas and Concepts:</h3>
<u>Math</u>
<u>Pre-Algebra</u>
Order of Operations: BPEMDAS
- Brackets
- Parenthesis
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
<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>
[Given] 1.7 × 10²⁵ molecules CaF
[Solve] moles CaF
<u>Step 2: Identify Conversions</u>
Avogadro's Number
<u>Step 3: Convert</u>
- [DA] Set up:
- [DA] Multiply/Divide [Cancel out units]:
<u>Step 4: Check</u>
<em>Follow sig fig rules and round. We are given 2 sig figs.</em>
28.2298 mol CaF ≈ 28 mol CaF
Answer: B. Allow for movement
Explanation: Because the muscular system is composed of specialized cells called muscle fibers. Their predominant function is contractibility. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement. Nearly all movement in the body is the result of muscle contraction. Make sure to add me as a friend!!! <3 YW!!!
For this problem, we should use the Henry's Law formula which is written below:
P = kC
where
P is the partial pressure of the gas
k is the Henry's Law constant at a certain temperature
C is the concentration
Substituting the values,
1.71 atm = (7.9×10⁻⁴<span> /atm)C
Solving for C,
C = 2164.56 molal or 2164.56 mol/kgwater
Let's make use of density of water (</span>1 kg/1 m³) and the molar mass of NF₃ (71 g/mol).<span>
Mass of NF</span>₃ = 2164.56 mol/kg water * 1 kg/1 m³ * 1 m³/1000000 mL * 150 mL * 71 g/mol = 23.05 g
The method for making pure crystals of magnesium chloride from magnesium and dilute hydrochloric acid is given below:
<h3>Making pure crystals of magnesium chloride from magnesium and dilute hydrochloric acid</h3>
According to the reaction, magnesium and weak hydrochloric acid react to create magnesium chloride and release hydrogen gas.
MgCl2 (aq) + H2 from Mg (s) + 2HCl (g)
Following is the process for extracting pure magnesium chloride from the reaction.
First: Reaction
- Keep a beaker with the diluted hydrochloric acid inside.
- Add magnesium gradually until there is an excess or until no more gas appears to be escaping.
Second step: filtering
- Filter using a funnel and filter paper.
- Remove the surplus magnesium by filtering it out because the filtrate will contain aqueous (liquid) magnesium chloride. The surplus magnesium is in the residual.
To create solid crystals from the filtrate, go to:
Step three, crystallization.
- Transfer filtrate solution to a dish or basin for evaporation.
- Transfer filtrate solution to a dish or basin for evaporation.
- Use a Bunsen burner to provide heat
- Pour the solution into a basin that will evaporate it, then warm it over a water bath.
- Turn off the heat when crystals begin to form.
- Let the water drain until only pure crystals are left.
- Dry crystals in a heated oven or on absorbent paper.
Lastly, Precautions:
- Wear eye protection, especially when heating, and use personal protective equipment such gloves and lab coats.
- Prevent breathing in extra gases while the process is underway.
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