25.0cm3 of 0.020mol/dm3 sulphuric acid neutralises 18.6cm3 of barium hydroxide solution

1) find the concentration of the barium hydroxide solution in mol/dm3

2) find the concentration of the barium hydroxide solution in g/dm3

Acm ruler with main graduations from 1 to 10 from left to right there are 10 secondary graduations between each of the main graduations there is a line that begins. at the left end of the ruler 10 secondary graduations to the left of the “1 main graduation the right end of the line ends on the eighth secondary graduation to the right of 3 how long is the line