What mass of NaOH must be added to the solution to increase the concentration to 30.00% by mass?

1) 0.0625  g.

2) 0.0125 g.

3) 80.0 g If this right please try to help me!

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.