When a mixture of 10.5 g of acetylene (C2H2) and 10.5 g of oxygen (O2) is ignited, the resultant combustion reaction produces CO2 and H2O. How many grams of C2H2 are present after the reaction is complete?

How many grams of O2 are present after the reaction is complete?

How many grams of CO2 are present after the reaction is complete?

How many grams of H2O are present after the reaction is complete?

Answer asap need to be answered 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.

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions

If a sample of radioactive isotopes takes 600 minutes to decay from 400 grams to 50 grams, what is the half-life of the isotope?