Nitrogen has a melting point of -210.0°c and a boiling point of -195.8°c. a sample of nitrogen is heated from -215.0°c to -200.0°c. which of the following best describes what happens to the nitrogen atoms during this transition?
a.
they gain enough energy to move relative to one another.
b.
they gain so much energy that the attractive forces between them have no effect on their motion.
c.
they lose enough energy to be held in a permanent location.
d.
the attractive forces between them decrease, allowing the atoms to move relative to one another.

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

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it is reliable if two scientists recorded it