Answer: 3.3 moles
Explanation:
Sodium bromide has a chemical formula of NaBr.
Given that:
Mass of NaBr in grams = 340.5g
Number of moles of NaBr = ?
For Molar mass of NaBr, use atomic mass of sodium Na = 23g, bromine Br = 79.9g
So,molar mass of NaBr = (23g + 79.9g)
= 102.9g/mol
Recall that number of moles = (mass in grams/molar mass)
No. of moles = 340.5g/102.9g/mol
= 3.3 moles
Thus, 340.5 g of sodium bromide gives 3.3 moles of sodium bromide
