Molar mass KCl = <span>74.5513 g/mol
Number of moles:
21.9 / 74.5513 => 0.293 moles
Volume = 869 mL / 1000 => 0.869 L
Molarity = moles / Volume
Molarity = 0.293 / 0.869
=> 0.337 M</span>
Answer:
0.027×10²³ atoms of H
Explanation:
Given data:
Mass of phosphoric acid = 0.1488 g
Number of hydrogen atoms = ?
Solution:
First of all we will calculate the number of moles of H₃PO₄.
Number of moles = mass/molar mass
Number of moles = 0.1488 g/ 98 g/mol
Number of moles = 0.0015 mol
1 mole of H₃PO₄ contain = 3 mol of H
0.0015 mol× 3= 0.0045 mol
Now we will calculate the number H atoms.
1 mole = 6.022×10²³ atoms
0.0045 mol×6.022×10²³ atoms / 1 mol
0.027×10²³ atoms of H
To convert Scientific Notation to a decimal number, Prescribed steps are to be taken given below.
<h3>What is Scientific Notation ?</h3>
Scientific notation is a way of writing very large or very small numbers.
A number is written in scientific notation when a number between 1 and 10 is multiplied by a power of 10.
<h3>Steps to Calculate Scientific Notation ;</h3>
- Determine the exponent, n , on the factor 10 .
- Move the decimal n places, adding zeros if needed.
- If the exponent is positive, move the decimal point n places to the right.
- If the exponent is negative, move the decimal point |n places to the left.
- Check.
Learn more about Scientific Notation here ;
brainly.com/question/2005529
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1) Preliminar explanation:
Atoms are neutral spieces: they have the same number of positive charges (protons inside the nucleous) as of negative charges (electrons around the nucleus).
Ions are formed by the gain or loss of electrons.
Positive ions are formed when neutral the atoms lose electrons, and negative ions are formed when neutral atoms gain electrons. Only the elctrons are gain or loss in ions formation (the number of protons remain unchanged).
2) Conclusion (answer)
Therefore, mathematically an ion is the result of adding or subtracting electrons to an atom, creating an imbalance of charge, positve when the atom ends up with less electrons than protons (loss of electrons) or negative when the atoms ends up with more electrons than protons (gain of electrons).
Greetings!
The amount of a substance that can dissolve in a liquid (at a any temperature) is called the solubility of the substance, (in this case water).
<em>Hope this helps!</em>