username5781437
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Calculate the number of barium ions in 1.50g of barium oxide.
Give your answer in standard form and to three significant figures.
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gd99
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Have you had a go at it? It’s best if you try to do it, post your answer then someone here can explain it if you’ve not done it correctly.
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scimus63
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calculate the Mr of BaO = 153.
calculate the number of moles of barium oxide you have = 1.5/153 = 9.8 x 10-3 moles

multiply this by avogadro constant for number of barium ions!
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