Which of these terms refers to matter that could be heterogeneous?

1) To express 0.89% m/v, it equals 0.89 grams of NaCl per 100 ml of solution.

This corresponds to 8.9 grams of NaCl in 1000 ml of solution, or 8.9 grams in 1 liter.

2) Molarity is represented as M = moles of solute / liters of solution.

Thus, we need to determine the moles in 8.9 grams of NaCl.

3) The molar mass of NaCl is calculated as 23.0 g/mol + 35.5 g/mol = 58.5 g/mol.

4) Therefore, the number of moles of NaCl calculates as mass / molar mass = 8.9 g / 58.5 g/mol = 0.152 moles.

5) Consequently, M = 0.152 moles of NaCl / 1 liter of solution = 0.152 M.

Answer: 0.152 M

Propane

is classified as neutral, meaning it does not act as an acid or a base
.

Answer:

The molality of the solution is 1.08 m.

Explanation:

First, determine the mass of the solvent.

A 13% solution by mass indicates that 13 grams are found in every 100 grams of solution.

Thus, solution mass = solute mass + solvent mass

100 g = 13 g + solvent mass

Therefore, solvent mass = 100 g - 13 g → 87 g

Next, we calculate the moles of solute (mass / molar mass):

13 g / 138.2 g/mol = 0.094 moles

Finally, to find the molality, which is the moles of solute per 1 kg of solvent (mol/kg), we convert the solvent mass to kg:

87 g. 1 kg / 1000 g = 0.087 kg

Then, molality → 0.094 mol / 0.087 kg = 1.08 m

Answer:

The Lewis-dot structure: illustrates the connections between atoms within a molecule and indicates the unpaired electrons that are found in it. Dots are used to represent the electrons.

The molecule in question is the perbromate ion.

Bromine possesses '7' valence electrons, while oxygen has '6' valence electrons.

Thus, the overall count of valence electrons in the perbromate ion is = 7 + 4(6) + 1 = 32

Based on the Lewis-dot structure, there are 14 bonding electrons and 18 non-bonding electrons present.

The formula for determining formal charge:

Displayed below is the Lewis-dot structure of the perbromate ion.