You want to test how the mass of a reactant affects the speed of a reaction. Which of the following is an example of a controlled experiment to test this?
A. The mass of one reactant and the temperature of the reaction
mixture are increased until the reaction is finished.
B. The mass of all of the reactants is kept the same, and the
mixtures are allowed to react for different lengths of time,
N
C. The mass of one reactant at a time is varied, and the time it takes
the reaction to finish is measured.
O D. The mass of all the reactants is varied, and the time it takes the
reaction to finish is measured.

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

where are the choice options?

yes

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