Answer: 266.055 g
Explanation:
We have the following data related to this unknown substance:
are the grams of substance
is the molarity of the substance, given by the following formula:
(1)
In this case the volume of solution is
Finding the moles of solute:
(2)
(3)
Now we have to convert this to grams by the following relation:
(4)
Finding :
(5)
(6)
Answer:
First one c for the second one i think is c sorry if wrong hope this help
Explanation:
Its a 3.0m solution so 1 litre of solution contains 3 moles of NaOH, 250ml of solution contains 0.25x39.9971 g/mol, so 250ml of this solution contains 0.75x39.9971=29.99g, or if you round it up 30.0g
The reaction, 4Fe (s) + 3O2 (g) -> 2 Fe2O3 (s), is the rusting of iron. As the reaction proceeds, the color of the <span>solid will change due to the reacction of iron with air. The rest of the choices do not answer the question above.</span>