CHEMISTRY MIDDLE SCHOOL

If molarity = moles liter , then how many grams of NaCl are needed to make 1 liter of a 0.1 M solution? A) 0.0584 g NaCl B) 3.246 g NaCl C) 5.844 g NaCl D) 58.44 g NaCl

Answers

Answer 1

Answer:

The grams of NaCl that needed to make 1L of a 0.1 M solution is

5.845 g (answer C)

calculation

Step 1: find the moles of NaCl

moles = molarity x volume in liters

molarity = 0.1 M =0.1 mol/l

= 1 L x 0.1 Mol/L = 0.1 moles

Step 2: find the mass NaCl

mass = moles x molar mass

From periodic table the molar mass of NaCl = 23 +35.45 =58.45 g/mol

mass= 0.1 moles x 58.45 g/mol =5.845 g appropriate ( answer C)

Answer 2

Answer:

Answer : Option C) 5.844 g NaCl

Explanation :

To calculate the number of grams of NaCl that would be needed to make 0.1 M of solution we have to calculate;

The molecular weight of sodium chloride (NaCl) which is 58.44 g, so one gram molecular weight will be= 1 mole which is 58.44 g.
By dissolving 58.44 g of NaCl upto the final volume of 1 litre, one can get 1 M NaCl solution.
So, to make 0.1 M NaCl solution we have to dilute the mass of salt to 1000 ml of solution as follows;
0.1 M NaCl solution will require 0.1 x 58.44 g of NaCl = 5.844 g. of NaCl.

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172 is correct

Answers

Answer:

Option d = 172 g/mol

Explanation:

Formula mass of [CaSO₄.2H₂O]

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The formula mass of compound calcium sulfate dihydrate is 172 g/mole.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

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The formula mass of compound = 40+32+16×4+4+32=172 g/mole.

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Answers

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