10. A certain binary ionic compound has the chemical formula, A 3B2. Which statement is true about the chemical formula?
A. There are 3 cations and 2 anions in the formula.
B. There are 2 cations and 3 anions in the formula.
C. The formula name ends in -ate.
D. The formula name ends in -ite.

a. a primary source combines several different accounts of an event. b. a primary source generally benefits from having been written after an event.

explanation:

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol