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Rina8888 [55]
2 years ago
15

what is the molarity of a solution prepared by dissolving 1.25g of HCL gas into enough water to make 30cm cube of solution?

Chemistry
1 answer:
Tpy6a [65]2 years ago
4 0
Molars are cavities in your teeth the dentists will scrape them out and fill them in for you at your earliest convinence need help with anything else while im here i can assist you!
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A rock contains 0.623 mg of 206Pb for every 1.000 mg of 238U present. Assuming that no lead was originally present, that all the
maxonik [38]

Answer:

t = 3,496x10⁹ years

Explanation:

The decay of ²³⁸U is:

²³⁸U → ²⁰⁶Pb + 8He + 6e⁻

Moles of ²⁰⁶Pb presents in 0,623mg are:

0,623x10⁻³g×(1mol / 206g) = 3,02x10⁻⁶ moles of ²⁰⁶Pb.

These moles are equals to moles of ²³⁸U before decay, that means, 3,02x10⁻⁶ moles²³⁸U

In grams:

3,02x10⁻⁶ moles²³⁸U× (238g / 1mol) = 7,20x10⁻⁴ g ²³⁸U = 0,720 mg²³⁸U

That means initial ²³⁸U was 1,000mg + 0,720mg =<em> 1,720mg</em>

Applying the formula:

ln (N₀/N) t₁₂ = t ln2

Where N₀ is initial amount of uranium (1,720mg), N is concentration of uranium (1,000mg),  half-life time is a constant (t₁₂= 4,468x10⁹ years) and t is the time transcurred for the reaction. Replacing:

ln(1,720/1)*4,468x10⁹ years = t ln2

<em>t = 3,496x10⁹ years</em>

<em></em>

I hope it helps!

6 0
2 years ago
The following properties are either physical or chemical. Which one is different from the rest based on those two categories?
inysia [295]

Mass

Explanation:

Mass is different from the rest based on those two categories.

Physical properties are the properties of matter that are usually determined with our senses like taste, feel, color, odor e.t.c

Chemical properties are the properties that relates to a substance when changes are occurring to it.

These properties are boiling point, magnetism and thermal conductivity among others.

Mass is not a physical nor chemical property. It is classified as an extensive property of substances which varies according to the amount of matter it contains.

Learn more:

chemical change brainly.com/question/9388643

#learnwithBrainly

5 0
3 years ago
Is anyone good at chemistry?
Rudiy27
Depends on what your question I currently have a 99 in there
5 0
3 years ago
The body’s pH is tightly regulated because specific enzymes function best within a narrow pH range. What is the approximate pH o
tatuchka [14]

Answer:

The answer to your question is pH = 9.08

Explanation:

Data

pH = ?

Concentration = 1.2 x 10⁻⁵ M

Process

1.- Calculate the pOH of the solution

Formula

   pOH = -log[OH⁻]

   pOH = -log[1.2 x 10⁻⁵]

   pOH = 4.92

2.- Calculate the pH

Formula

    pH = 14 - pOH

Substitution

    pH = 14 - 4.92

Result

    pH = 9.08    

5 0
3 years ago
Question 2
lyudmila [28]

Answer:

Chemical properties because if it was physical property then it will glow in dark

3 0
1 year ago
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