Which part of a chemical formula indicates the number of atoms of an element that make up a molecule? A. plus signs B. subscript
2 answers:
<u>Answer:</u> The correct answer is Option B.
<u>Explanation:</u>
For the given options:
<u>Option A:</u> Plus sign is written in a chemical equation to show the number of chemical species reacting or getting produced.
Option B: Subscript numbers are defined as the number of atoms of each element present in a compound.
For Example: In , 2 atoms of hydrogen element is there and 1 atom of oxygen element is there.
<u>Option C:</u> Coefficients are defined as the numbers which are written in front of the atoms or molecules in a chemical reaction. They represent the number of moles of substance in a chemical reaction.
<u>Option D:</u> Chemical symbols are used to write the short form of the elements.
Hence, the correct answer is Option B.
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The question is incomplete, here is the complete question:
At 25°C Henry's Law constant for carbon dioxide gas in water is 0.031 M/atm . Calculate the mass in grams of gas that can be dissolved in 425. mL of water at 25°C and at a partial pressure of 2.92 atm. Round your answer to 2 significant digits.
<u>Answer:</u> The mass of carbon dioxide that can be dissolved is 1.7 grams
<u>Explanation:</u>
To calculate the molar solubility, we use the equation given by Henry's law, which is:
where,
= Henry's constant =
= molar solubility of carbon dioxide gas
= partial pressure of carbon dioxide gas = 2.92 atm
Putting values in above equation, we get:
To calculate the mass of solute, we use the equation used to calculate the molarity of solution:
Given mass of carbon dioxide = ? g
Molar mass of carbon dioxide = 44 g/mol
Molarity of solution =
Volume of solution = 425 mL
Putting values in above equation, we get:
Hence, the mass of carbon dioxide that can be dissolved is 1.7 grams