PLEASE HELP FAST!! How many moles are contained in 500 mL of a 3.5M NaOH solution?
1 answer:
Answer:
1.75 moles are contained in 500 mL of a 3.5 M NaOH solution.
Explanation:
Molar concentration is a measure of the concentration of a solute in a solution, be it some molecular, ionic or atomic species and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution.
Molarity is expressed in units .
In this case:
- molarity= 3.5 M
- number of moles of solute= ?
- volume= 500 mL= 0.5 L
Replacing:
Solving:
number of moles of solute= 3.5 M*0.5 L
number of moles of solute= 1.75 moles
<u><em>1.75 moles are contained in 500 mL of a 3.5 M NaOH solution.</em></u>
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Answer:
<h2>106.62 mL</h2>Explanation:
The volume of a substance when given the density and mass can be found by using the formula
From the question
mass = 83.7 g
density = 0.785 g/mL
We have
We have the final answer as
<h3>106.62 mL</h3>Hope this helps you
Rhenium is a chemical element with the symbol Re and atomic number 75. The electron configuration of Re is [Xe] .
1. Identify the given element and its atomic number from the periodic table.
2. Write the electron configuration by the energy level and the type of orbital first, then the number of electrons present in the orbital as superscript.
The easiest way to write the electronic configuration for any element is by using a diagonal rule for electron filling order in the different subshells according to the Aufbau principle.
The 3 rules for writing the electron configuration in the orbital box diagram are – the Aufbau rule, the Pauli-exclusion rule, and Hund's Rule.
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