Please help me with this one true or false

41. False

42. True

43. False

44. False

45. True

46 - 48. Unsure (I don't take Biology, sorry.)

Explanation:

41.

FeS and HCl are the reactants of the chemical equation. Hence, false.

42.

It is common knowledge that HCl and H₂SO₄ are acids. Hence, true.

43.

Vinegar contains acetic acid CH₃COOH, which isn't a base. Hence, false.

44.

Fluorescence is actually the emittance of light by any substance due to radiation. Hence, false.

45.

Yes, the image produced by a plane mirror is laterally inverted. Hence, true.

answer: i would say b.

explanation:

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