Two different liquids are poured together in an open container. Bubbles begin to form. After the bubbling stops, it is determined that the total
weight of the two liquids is less than before they were poured together.
Which best describes this observation?
Some of the atoms during the reaction escaped into the air
O. Some of the atoms during the reaction were destroyed
O Some of the atoms during the reaction became heavier
Some of the atoms during the reaction changed to a different kind of atom

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

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.