The enthalpy changes, δH , for three reactions are given. H2(g)+12o2(g)ca(s)+2h+(aq)cao(s)+2h +(aq)⟶h2o(l)⟶ca2+(aq)+h2(g)⟶ca2+(aq )+h2o(l)δH=−286 kj/molδH=−544 kj/molδH=−193 kj/mol using hess's law, calculate the heat of formation for cao(s) using the reaction shown. Ca(s)+12o2(g)⟶cao(s).

Alaser tag arena sells two types of memberships. one package costs $325 for one year of membership with an unlimited number of visits. the second package has $125 enrollment fee, includes five free visits, and costs and additional $8 per visit after the first five. how many visits would a person need to use for each type of membership to cost the same amount over a one-year period?

You are getting ready to transport troops in a m1152 configured with cargo cover and troop seats which of the following should you do before starting out

You can reduce glare in snowy weatuer by?