Calculating Molar Mass Of A Compound Chemistry Worksheet With Answers printable pdf download

Calculating Molar Mass Of A Compound Chemistry Worksheet With Answers

Instructions for Conversion Problems

For every conversion problem

Write the number in the problem down with unit and a multiplication sign

Decide which conversion factor you should use, Avagadro’s or molar mass.

Use your index card to determine which way you should use your conversion factor.

Then write the conversion factor down next to the multiplication sign.

Make sure your units cancel and you have the unit you’re solving for on top.

Remember all numbers must have units.

Cancel your units then solve the problem. You should enter the numbers in your

calculator just as you see them on your paper. The number you are given in the problem

always goes first.

If you have an exponent don’t forget to use the 2

, button. This takes the place of the

x10. So on your calculator it should read, 6.02E23.

Then put your answer down in proper sig. figs and unit. Don’t forget to look to see if

there is an E at the end.

Calculating Molar Mass of a Compound

Remember to determine the molar mass of an element you look at the periodic table. We

will only use 3 sig figs…. If more than 3, round to proper number.

If you have a compound, need to

write down each element in the compound in a column.

Next to the element write the number of each element. If you have a parentheses

you must multiply the numbers inside by the one outside.

Next to the number of each element, write a multiplication sign (x).

Look up mass of each element on the periodic table and write it next to the times

sign.

Place an = sign next to the mass of each element.

Multiply the number of each element by its mass and write the number next to the

= sign.

Go to the last column and add the masses. This is your molar mass of a

compound.

Sometimes, you will need to use both factors to convert. Remember the Chemistry two-

step. You just have to go from grams to mole then to particles or vise versa.

Calculating Molar Mass Of A Compound Chemistry Worksheet With Answers