Can someone help me to understand this question? 2Na(s) + 2H2O (I) —> Na+(aq) + 2OH-(aq) + H2(g)

1.15 g of sodium react completely with an excess of water. The resulting solution is diluted to 0.250 dm3. Calculate the concentration of hydroxide ions in the dilute solution. Answer in mol / dm3 to two decimal places.

Sorry i dont understand the question can you rephase it?

Ithe undersigned only for use your own email and delete any and copies and of the itself and to be there is a good timewhat does a decrease in temperature indicate about the molecules in a sample of liquid water? decreased chemical energy of the moleculesdecreased kinetic energy of the moleculesincreased chemical energy of the moleculesincreased kinetic energy of the moleculeshow does a sample of helium at 15 â°c compare to a sample of helium at 215 k? the helium at 15 â°c has a higher average kinetic energy than the sample at 215 k.the helium at 15 â°c has lower nuclear energy than the sample at 215 k.the helium at 15 â°c has slower-moving atoms than the sample at 215 k.the helium at 15 â°c has smaller atoms than the sample at 215 k.