What noble gas element has the same number of electrons as o-2

Calculate the molarity of 48.0 ml of 6.00 m h2so4 diluted to 0.250 l .

Hey guys so i need to know what is _nh3+> nh4oh ~chemistry~

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign