In a coffee-cup calorimeter, 1 mol naoh and 1 mol hbr initially at 25.5 oc (celsius) are mixed in 100g of water to yield the following reaction: naoh + hbr → na+(aq) + br-(aq) + h2o(l)after mixing the temperature rises to 86 oc. calculate the change in enthalpy of this reaction. specific heat of the solution = 4.184 j/(g oc)the molecular weight of naoh is 40.0 g/mol, and the molecular weight of hbr is 80.9 g/mol.δh =

The speed of light is around 6.706×10^8 miles per hour. what is the speed of light in units of miles per minute?

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3 -> a2cr(no3)3 + a3ag2so4

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.