Chemistry, 20.05.2021 05:00 QuestionsAnsweredNow

How many moles of solute are in 250 mL of 2.0 M CaCl ?

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Answer from: squawk1738

$\boxed {\boxed {\sf 0.5 \ mol \ CaCl}}}$

Explanation:

Molarity is a measure of concentration in moles per liter.

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

We know the molarity is 2.0 M CaCl. However, we can convert the units to make the problem easier. 1 molar (M) is equal to 1 mole per liter. A 2.0 M CaCl molarity is equal to 2.0 moles of CaCl per liter.

We also know there are 250 milliliters of solution. however, we need to find the liters. Remember that 1 liter contains 1000 milliliters.

$\frac { 1 \ L}{1000 \ ml}$ $250 \ mL * \frac { 1 \ L}{1000 \ ml}$ $250 * \frac { 1 \ L}{1000}= 0.250 \ L$

Now we can substitute the values we know into the formula. Since moles of solute are unknown, we can use x.

molarity= 2.0 mol CaCl/ L moles of solute =x liters of solution = 0.250 L

$2.0 \ mol \ CaCl/ L= \frac{x}{0.250 \ L}$

Since we are solving for x (the moles of solute), we need to isolate the variable. It is being divided by 0.250 L. The inverse of division is multiplication, so we multiply both sides by 0.250 L.

$0.250 \ L *2.0 \ mol \ CaCl/ L= \frac{x}{0.250 \ L} * 0.250 \ L$

$0.250 \ L *2.0 \ mol \ CaCl/ L=x$

The units of liters (L) cancel.

$0.250 * 2.0 \ mol \ CaCl=x$

$0.5 \ mol \ CaCl=x$

There are 0.5 moles of solute in 250 milliliters of a 2.0 M solution.

Answer from: Quest

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Answer from: Quest

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).

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