A mole is a unit defined to be .
2. The molar mass of an element is the mass of one .
3. What do the subscripts represent in a molecular formula? .
4. The representative particle for an ionic compound is a .

5. Find the molar mass of Al2(SO3)3 294.15 g Al2(SO3)3
6. How many moles are in 2.4g of carbon dioxide (CO2)? 0.05 mols CO2
7. Calculate the mass in grams of 3.50 x 1025 atoms of lithium. 404g Li
Phrase Bank
A. the actual # of atoms present in one molecule
B. mole of the element
C. 6.02 x 10 23 particles of a substance
D. formula unit
8. How many sodium atoms are there in 26.3 grams of sodium oxide (Na2O)?
2.55 E 23 molecules of Na2O
9. How many molecules of Mg3N2 (magnesium nitride) are formed when excess Mg (magnesium)
reacts with 24.3 moles of N2 (nitrogen gas)?
3Mg(s) + N2(g) → Mg3N2(s) 1.46E25 molecules Mg3N2
10.
1. 32.5grams of NaOH (sodium hydroxide) reacts an excess of CO2 (carbon dioxide).
2NaOH(s) + CO2(g) → Na2CO3(s) + H2O(l)

a. What is the theoretical yield of Na2CO3 in grams? 43.1g Na2CO3
b. If 16.45 g of Na2CO3 is formed, what is the percent yield? 38.2%

you need to show work for every thing starting from the 5th one. if it doesnt produce the answer on the side then the work is incorrect.

answer choices for 1-4:

A. the actual # of atoms present in one molecule
B. mole of the element
C. 6.02 x 10 23 particles of a substance
D. formula unit