Chemistry Forum

1.What is the mass of 1 mole of lithium hydroxide (LiOH)?

2.A saltshaker filled with 17 grams of sodium chloride (NaCl) contains how many moles of sodium chloride?

3.In 60 g of N₂O, there are how many molecules?

4.Find the molar mass for each of the following:
Mn
CaCl₂
5.Find the number of moles of each of the following:
25 g of Ar
38.6 g of Mg(OH)₂
6.Find the number of atoms in each of the following:
1.32 moles F₂
3.15 moles K₃PO₄
7.Find the volume of each of the following amounts of gas at STP:
0.72 moles of O₂
3.4 moles N₂
8.How many moles are in each of the following volumes of gas at STP?
83.5 L CO₂
55.2 L He
9.Find the mass of each of the gas samples in question 8.
a)
b)
10) A compound is 43.4%Na, 11.3%C, 45.3%O.
a. In a 100.g sample of this substance there will be:
_________ g Na = ________ mol Na
_________ gC = ________ mol C
_________ gO = ________ molO
b. For each mole of C, how many moles of Na are there? (ratio of mol Na to mol C)_____
c. For each mole of C, how many moles of O are there? (ratio of mol O to mol C)_____
d. What is the formula for this compound? _____________


PLEASE HELP