james needs 4.20 moles of nabr for an experiment. how many grams of nabr must he measure out to have 4.20 moles?
2 answers:
<u>Ans: Mass of NaBr = 432 g</u>
<u>Given:</u>
# moles of NaBr = 4.20 moles
<u>To determine:</u>
The mass corresponding to 4.20 moles of NaBr
<u>Explanation:</u>
The # moles of a given substance is the ratio of its mass to molar mass
moles = mass (g)/molar mass (g.mol-1)------(1)
Molar mass of NaBr = 102.89 g/mol
Based on equation(1)
mass = moles * molar mass
= 4.20 moles * 102.89 g.mol-1 = 432 g
75.7 grams.
Convert moles to grams using this:
Moles • grams/1 mole = grams
(Grams is over 1 mole)
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