reneebrown017
28.09.2019 •
Chemistry
How many liters of oxygen gas, at standard temperature and pressure, will react with 25.0 grams of magnesium metal?
2mg + o2 yields 2mgo
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Ответ:
1.028383381 mol Mg(1 mol O2/2 mol Mg)=.5141916907 mol O2
.5141916907 mol O2(22.4 L/1 mol)=11.51789387 L O2 gas
Ответ:
The concentration given here is in terms of molality which is moles of solute per kg of solution. Therefore, we multiply the concentration by the total mass of the solution and obtain the moles of solute. We can convert this into grams and calculate for the solvent.
0.630 mol KBr / kg solution ( .086 kg solution ) = 0.0542 mol KBr
0.0542 mol Kbr ( 119.002 g / 1 mol ) = 6.4475 g KBr
Mass of solvent = 86 - 6.4475 = 79.55 g water
Explanation: