ASAP PLZ The table shows the amount of radioactive element remaining in a sample over a period of time. Radioactive Decay Rate Amount of Radioactive Sample (grams) Time (years)
56.0--0
47.1---400
39.6--800
33.3 --1,200
281,600
Part 1: What is the half-life of the element? Explain how you determined this. Part 2: How long would it take 312 g of the sample to decay to 9.75 grams? Show your work or explain your answer.

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

your answer would be “dry”

2b2t

explanation:

2b2t

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%).