I'm stuck on my chemstry coursework. I have all these different concentrations of sodium thiosulphate, and they are in ml. So for example there is 30 ml of water and 30 ml of sodium thio. How do I convert them into Moles?
2007-02-28 05:07:27 · 3 answers · asked by antique9rice 2 in Education & Reference ➔ Homework Help
Step 1: Multiply the volume given by the density to find mass.
Water: 30 mL * 1g/mL = 30g
Na2S2O3: 30 mL * 1.667 g/mL = 50g
Step 2: Find the molar mass by adding up the mass of each element used to create the compound.
H2O = 2 * H + O = 2 * 2 + 16 = 18 g/mol
Na2S2O3 = 2 * Na + 2 * S + 3 * O = 2 * 23 + 2 * 32 + 3 * 16 = 46 + 64 + 48 = 158 g/mol
Step 3: Divide the mass of each compound by the molar mass:
H2O = 30g / 18 g/mol = 1.67 moles
Na2S2O3 = 50g / 158 g/mol = .316 moles
2007-03-01 02:32:52 · answer #1 · answered by ³√carthagebrujah 6 · 0⤊ 0⤋
Remove Your Moles, Warts & Skin Tags in 3 Days
Easily, Naturally And Without Surgery
2016-05-16 03:04:58 · answer #2 · answered by Anonymous · 0⤊ 0⤋
HCl @2mol. this suggests 2 moles in line with litre (mol dm^3) One litre consists of one thousand cm^3 so in a million cm3 you have 2/one thousand = 0.002 mols. in case you extra 9 cm3 there is now 10cm3 containing 0.002 mol. the hot conc'n is 10cm3 x one hundred = 1000cm3 0.002 x one hundred = 0..2 mol dm^-3 in spite of the undeniable fact that, is in basic terms a million cm^3 grow for use then in basic terms 0.002 mols is used and including 9 cm^3 there remains in basic terms 0.002 mols used in spite of the undeniable fact that it extremely is diluted. to a conc'n of 0.2 mol dm^-3
2016-11-26 20:30:02 · answer #3 · answered by quest 4 · 0⤊ 0⤋