Nitromethane (CH3NO2) burns in air to produce significant amounts of heat. 4 CH3NO2 (l) + 3 O2 (g) → 4 CO2 (g) + 6 H2O (l) + 2 N2 (g) , ΔHorxn = -2836 kJ If 1,273 kJ of heat are produced from the burning of nitromethane, how many grams of nitromethane were burned?

27.38 g

Explanation:

The value of ΔHorxn tells us that when 1 mol of CH₃NO₂ is burned, 2836 kJ of heat are produced. With that in mind we can calculate how many moles of CH₃NO₂ were burned when 1273 kJ of heat were produced:

Then we convert 0.4489 moles of CH₃NO₂ to grams, using its molar mass:

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .

b is the correct answer

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