indint need you to show the work i just need rhe mulitiple choice answer for all and i give thumbs up

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Which of the following reactions is exothermic? H2(g) + O2(g) → H₂O(g) AH = -243 kJ/mol ON2(8) + O2(g) + 90.7 kJ → NO(g) OCO(g) + 111 kJ → C(s) + O2(g) H2(g) +12(g) → HI(g) AH = + 26 kJ/mol

In a calorimeter, a 2.0 mol sample of magnesium is burned to form MgO. In doing so, 25.5 kJ of energy are released. What is the molar enthalpy of combustion in kJ/mol of magnesium? 12.75 1.54 x 1025 0.0392 620 25.5

Which statement about this diagram is true? reactant Ep products Reaction Progress The system is endothermic The system absorbs heat from the surroundings ΔΗ is negative The heat content of the reactants is less than the heat content of the products

For which one of the following substances is the standard enthalpy of formation, AHºf, equal to zero? Owater [H₂O(1)] Sulfur trioxide [SO3 (8)] Nitrogen monoxide [NO (g)] O Carbon dioxide [CO2 (9)] Bromine [Br2 (9)]

Which functional group is always on carbon #1 amines ketone carboxylic acid alcohol

The IUPAC name for the following compound is: CH₂ CI CH₂ CH₂ CH₂CH=CHCH₂CH₂CCH, I CI O2-methyl-3-ethyl-6,6 dichloro-heptane 2,2 dichloro-5-ethyl-6-methyl-heptane 6,6-dichloro-3-ethyl-2-methyl-heptane O2-chloro-5-ethyl-6-methyl-heptane 6-chloro-3-ethyl-2-methyl-heptane

The IUPAC name for the following compound is: CH3-CH₂- OC-CH₂-CH3 - diethyl carbonate Oethyl ethanoate ethyl acetate On-propyl ethanoate Oethyl propanoate

What type of molecule has an -OH group bonded to a carbon that is attached to two other carbons? tertiary amine secondary alcohol secondary amine tertiary alcohol

The IUPAC name for the following compound is: C-OH CH3 I CH3-CH₂-CH₂-CH-CH₂ 3-methyl hexanoic acid 4-methyl pentanoic acid 2-methyl pentanoic acid 4-methyl hexanoic acid 3-methyl hexanol