Question

A chemist wants to make 6.5 L of a .350M CaCl2 solution. What mass of CaCl2(in g) should the chemist use?

Answer 1

first M stands for Molarity which is (moles of solute) / (Liters of solution). we also know that moles = (mass) / (molar mass). so we can form some equations here. We know:
Molarity (M) = moles (mol) / Liters (L)
moles (mol) = (mass) / (molar mass)

we can substitute the (mass) / (molar mass) for (moles) and get:
M = [(mass) / (molar mass)] / Liters

we can now isolate mass and get
M * Liters * molar mass = mass

now we need to find the molar mass of CaCl2 which is 110.98 g/mol

plug the values in and get
.350M * 6.5L * 110.98 g/mol = mass

mass = 252.4795g however the 6.5L has only 2 sig figs so i would say

mass CaCl2 = 2.5 * 10 ^2 g

Answer 2

Known: M = 350 M

             Mol = 6.6 L

             Molar mass of CaCl2 = 110.98 g / ml

Asked: Mass of CaCl2?

Answer: First, we will use the formula:

               M = {(mass) / (molar mass)} / mol

               => mass = M x mol x molar mass

               Second, enter a known value

               mass = 350 M x 6.5 L x 110.98 g / mol

               CaCl2 mass = 2.5 x 10 ^ 2 g

               So, the mass of CaCl2 is 2.5 x 10 ^ 2 g.

Further Explanation

Molarity is a quantity that can express the number of moles of solute in each unit volume of solution. The unit of molarity is the molar (M) which is equal to mol/liter. If there are (n) moles of compounds dissolved in (V) liters of a solution.

A mole is a mathematically obtained unit, involving several other units such as the relative molecular mass, and the average atomic mass. A mole is defined as the number of particles contained in a particular substance where the number is equal to the number of atoms contained in 12.00 grams of C-12 atoms. C-12 is a carbon isotope that has a definitive standard atomic weight of 12. Therefore, the mass of this carbon isotope has an exact weight of 12 grams. The use of carbon as a basis for determination because carbon is the element most often and easily found in nature.

The chemical reaction is the event of chemical change from substances that react (reactants) into substances that result from reactions (products). In chemical reactions, new substances are always produced with new properties. Chemical reactions are written using the element symbol. Let's look at how to express a reaction using symbols.

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Details

Grade: College

Subject: Chemistry

keywords: Molarity