Need Chemistry Help - questions about Moles?

I need help doing calculations and converting numbers to moles and etc.


I need to know how to solve the problems...like what steps would you take to do it





1. Calculate the molar mass of the following:


H 2 SO 4......*2 and 4 are subscripted


2. calculate following conversions


a. how much does 3.2 moles of He weigh?.....(mass of He is 4.00)


b. What is the mass of 2.29 x 10 to the 23 (power) molecules of CO 2 (2 subscripted)


c. How many moles of lithium atoms are in a 5.34 g of Lithium?


mass for lithium is 6.94


d. How many sodium atoms are in 6.9 moles of sodium atoms?





I do not know how to do the conversions....here's a set up of what it's suppose to look like::





What is the mass of 3.5 moles of Lead (Pb)?


3.5 moles x 207.72/1 mole = 725.2 g

Need Chemistry Help - questions about Moles?
the equation you proposed is correct..just use the same procedure.





item being converted x (item unknown/conversion factor)





conversion factor shld have the same unit as the item being converted