How many moles of Strontium Hydroxide, Sr(OH)2, are there in a 4.25 gram sample of Strontium Hydroxide?

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How many moles of Strontium Hydroxide, Sr(OH)2, are there in a 4.25 gram sample of Strontium Hydroxide?

Help is appreciated.

2007-01-11 07:15:07 · 3 answers · asked by Random G 3 in Science & Mathematics ➔ Chemistry

3 answers

To find the number of moles in a sample of a given mass, divide the number of grams by the compounds molar mass.

Moles = grams of compound / molar mass of compound

The molar mass of Strontium Hydroxide is: 121.63 g/mol

moles of Sr(OH)2 = 4.25 g / 121.63 g/mol
moles of Sr(OH)2 = .0349 moles

2007-01-11 07:23:52 · answer #1 · answered by mrjeffy321 7 · 0⤊ 0⤋

2007-01-11 15:19:26 · answer #2 · answered by Anonymous · 0⤊ 1⤋

0.0349 moles. 0.035 moles taking into consideration sig. figs.

2007-01-11 15:21:26 · answer #3 · answered by ChemMon 1 · 0⤊ 0⤋