A laboratory has a 2.0-mol sample of pure selenium and a 2.0-mol sample of pure chromium. How many more grams of selenium than chromium does this represent?

A) 65.5 g

B) 53.9 g

C) 27.0 g

D) 13.5 g

The reaction described by H2 (g) + I2 (g) ⟶2HI (g) has an experimentally determined rate law of rate=k[H2][I2] Some proposed mechanisms for this reaction are: Mechanism A (1) H2 (g) + I2 (g) - →k12HI (g) (one-step reaction) Mechanism B (1) I2 (g) ⥫⥬=

Object a has a mass of 3,600 kilograms. Object B has a mass of 600 kilograms. Object B has a mass of 600 kilograms. Both objects were placed on different planets so that their weights are equal.

2,3,5-trimethylhexane

Which elements on the periodic table fulfill the octet rule

Which of the following statements is true about cellular respiration? It converts energy into food, It breaks down food to release energy, It turns carbon dioxide into water. It tums water into carbon dioxide.

When paper turns yellow-brown upon exposure to sunlight, what type of change is likely taking place?

What are two beneficial uses of ultraviolet rays

If 1000. mL of linseed oil has a mass of 929 g, calculate the density of linseed oil.

Why is pure water not a conductor of electricity? A. Pure water has no free ions. B. Pure water has many dissolved solids. C. Pure water has few dissolved solids. D. Pure water has many free ions.

Why do the pH scale generally range from 0 to 14 in aqueous solution?