How many moles of carbon are in 7.87x10^7

Which arrow would most likely represent the phase change that involves the same amount of energy as arrow 1?

What is the density of an object having a mass of 8.0g and a volume of 25cm3

In an experiment, 4 liters of water was observed to evaporate in 20 hours. what rate of evaporation was observed in this experiment?

What must be done to the following half-reactions before they can be added together? Mn (s) → Mn 2 + (aq) + 2e - Fe 3 + (aq) + 3e - → Fe (s) Double the Mn half-reaction and triple the Fe half-reaction.

The cycling of carbon between the living and non-living parts of the Earth system is an important result of which of the following processes? a. Herbivores digesting plant material to get nutrients b.

Which of the following correctly identifies steps used in the fractional distillation of petroleum? The mixture is cooled, condenses, then heated and boils. The mixture is cooled, boils, then heated and condense.

What is the formula of the most stable oxide of francium?

You just calculated that the heat of fusion for chloromethane is 6400 J/mol. The heat of fusion for hydrogen is 120 J/mol. Which of the following account for this difference? a. Hydrogen has stronger intermolecular forces than chloromethane. b.

Magnesium burns with a very bright light. When the flame goes out, a White powder is left behind. what is the word equation for this reaction.

Identify the types of intermolecular forces found for each of the liquids and relate these to the shape of the drop as seen from the side. Include the terms cohesive and adhesive forces properly in your explanations.