A solution has a concetration of 0.3mol/dm3 of sodium hydroxide .what volume of the solution must be measured out to obtain 0.02mol of sodium hydroxide.

Sodium sulfate dissolves as follows: na2so4(s) → 2na+(aq) + so42- (aq). how many moles of na2so4 are required to make 1.0 l of solution in which the na concentration is 0.10 m?

What is true for a substance that releases energy

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world