Which of the following is not a correct statement? a hypothesis can be supported or rejected by through experimentation a theory is a hypothesis supported by experimentation to explain an observation a hypothesis is an attempt to explain an observation. a hypothesis is the result of a single measurement or observation.

For the things happening or changes occurring around us which doesn't have any scientific explanation, a scientist or a group of scientist gives a explanation based on the observation. This given theory is called hypothesis, it needs not be correct always, it can be right or wrong. This hypothesis is the result of many measurement and a lot of observation.

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