3. The heat of reaction for the following is -221 kJ. What is the heat of formation for CO(g) in kJ/mol? Record your answer on your answer sheet. Be sure to use the appropriate sign. 2C(s) + O2(g) ---> 2CO(g)​

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

answer: option (a) is the correct answer.

explanation:

the measurement of hydrogen ions in a solution is known as ph.

if ph of a solution is less than 7 then the solution is acidic. if ph of a solution is greater than 7 then the solution is basic.

when the ph of a solution equals 7, then the solution is considered as neutral.

the ph of pure water is 7, therefore, it means that concentration of hydronium ions equals that of hydroxide ions.