Molecules have a. only kinetic energy
b. only potential energy
c. both potential and kinetic energy
d. neither kinetic nor potential energy

B. Only potential energy C. Both kinetic and potential energy D. Neither potential nor kinetic 1 See answer All molecules move and therefore have kinetic energy. They also hold bond energies which I believe count as potential energy. Advertisement Advertisement

Explanation:

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

gas

explanation:

smoke is the matter of a gas