Chemistry, 02.06.2021 04:30 ctyrector

How many moles of solute are in a 1.50 M solution of HCl with a volume of 7.98 liters?

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Answer from: andrewschmitz132

$\boxed {\boxed {\sf x\approx 12.0 \ moles \ HCl}}$

Explanation:

Molarity is a measure of concentration in moles per liter.

$molarity= \frac{moles \ of \ solute}{liters \ of solution}$

We know the solution has a volume of 7.98 liters and it has a molarity of 1.50 M HCl.

1 molar (M) is 1 mole per liter, so the molarity is also 1.50 moles of HCl per liter.

We know 2 values for the variables, but the value for moles of solute is unknown, so we use x.

molarity= 1.50 mol HCl/L moles of solute=xliters of solution = 7.98 L

Substitute the values into the formula.

$1.50 \ mol \ HCl/L=\frac{x}{7.98 \ L}$

We are trying to solve for x, the moles of solute, so we must isolate the variable. It is being divided by 7.98 liters and the inverse of division is multiplication. Multiply both sides of the equation by 7.98 liters.

$7.98 \ L *1.50 \ mol \ HCl/L=\frac{x}{7.98 \ L} * 7.98 \ L$

$7.98 \ L *1.50 \ mol \ HCl/L=x$

The units of liters (L) cancel each other out.

$7.98 *1.50 \ mol \ HCl=x$

$11.97 \ mol \ HCl=x$

The original measurements of molarity and volume both have 3 significant figures, so our answer must have the same. For the number we found, that is the tenths place.

The 9 in the hundredth place tells us to round the 1 to a 2. We leave a 0 in the tenths place to ensure there are 3 significant figures.

$12.0 \ mol \ HCl \approx x$

There are approximately 12.0 moles of solute in the solution.

Answer from: Quest

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Answer from: Quest

definition

entropy is a measure of the randomness or the extent of disorder of a chemical process.

enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

entropy is measured in joule per kelvin (jk⁻¹) whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.