What would happen to an object of 2.5g/ml when is placed in 1g/cm3

It would sink because it is more dense.

Explanation:

When ever you see grams/mL or g/cm^3, know that they are the same thing.

mL = cm^3

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

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