2KCI(S) + 302(g) → 2KCIO3(s)
AHEKA = -435.9 kJ/mol
AHKCo, = -391.4 kJ/mol.
Which of these are true for the reaction above? Check all that apply.
AHrxn is 89.0kJ.
AHrxn is-827.3kJ.
The Teaction is endothermic, +AH.
The reaction is exothermic, -AH.
Heat is a reactant.
DONE

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step-by-step explanation:

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need more info

step-by-step explanation:

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81