PLEASE HELP In a lab, strontium (Sr) and oxygen (O2) are combined to produce strontium oxide (SrO). After balancing this reaction, determine how many grams of strontium oxide are produced by the complete reaction of 19.6 grams of strontium. Express your answer to the correct number of significant figures.
The mass of the SrO is ___ grams.

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Explanation:

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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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