Extra Credit Question Worth 2 Points! If the half-life of Pb-212 is 10.6 minutes, the half-life of Bi-212 is 61 minutes, and the half-life of Po-212 is
3.0 x 10-7 seconds what is the half-life of the entire decay series?
About 3 hours
About 3 years
About 72 minutes
About 72 hours
Less than 1 hour

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g

pie chart because it is in percents ( % )

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).