42 grams of NaOH are needed to make a 250.0 mL or a 4.2 M NaOH solution (option C).
<h3>How to calculate mass?</h3>
The mass of a substance can be calculated by multiplying the number of moles by its molar mass.
However, the number of moles of NaOH can be calculated using the following formula;
Molarity = no of moles ÷ volume
no of moles = 0.250L × 4.2 = 1.05mol
Hence, the mass of NaOH can be calculated as follows:
mass = 1.05 mol × 40g/mol = 42g
Therefore, 42 grams of NaOH are needed to make a 250.0 mL or a 4.2 M NaOH solution.
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Answer:
A solid has the molecules tightly packed together and are held in a fixed pattern.
A liquid has molecules that are packed together in a random fashion and can move freely.
A gas has molecules that are widely separated and randomly move and collide.
Explanation:
If you look on the periodic table, you'll find that oxygen is an element. You can also find out by looking up how each formula is written. Oxygen - O | Carbon Dioxide - CO2 | Water - H2O | Ammonia - NH3. An element has only one capital letter. Oxygen is the only one which falls under that category.
Answer:
The evaluation is correct.
Explanation:
Water has hydrogen bonding which is stronger than the dipole-dipole IMF of acetone. Thus, acetone has weaker IMFs.
One isotope differs from another in the number of neutrons they have.