I need help!! Pleasee

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

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

Insoluble sulfide compounds are generally black in color. which of the following combinations could yield a black precipitate? check all that apply. na2s(aq)+kcl(aq) li2s(aq)+pb(no3)2(aq) pb(clo3)2(aq)+nano3(aq) agno3(aq)+kcl(aq) k2s(aq)+sn(no3)4(aq)