What is the mass of 18.8 moles of helium (He) atoms?

0.213 g

4.70 g

37.6 g

75.2 g

How do you find chemical formula?

Why is DDT a dangerous environmental pollutant? Because it remains in the environment for a long time. Because it is very volatile. Because it reacts readily with other compounds. Because it takes electrons from other compounds and elements.

If you have 66.6 g nh3 how many grams of f2 are required for a complete reaction

Oxygen is in group 16 of the periodic table. An oxygen ion (O2-) has a charge of - 2. Which of the following would be most likely to combine with an oxygen ion to form a new compound? A. a calcium ion with a charge of + 2 B.

Which equation represents sublimation? (1) I2 (s) = = > I2 (g) (3) I2 (l) = = >I2 (g) (2) I2 (s) = = >I2 (l) (4) I2 (l) = = >I2 (s)

Which statement best describes electrolysis? Electrolysis stores electrons in an aqueous solution. Electrolysis converts chemical energy into electrical energy. Electrolysis separates protons and electrons in an electrolyte.

Why can xenon expand its octet to form compounds but neon can't

What do we call the group of organisms that share the same characteristics?

Oblicz masę azotu w pustym pomieszczeniu o wymiarach podanych na ilustracji gęstość azotu w temperaturze pokojowej wynosi 1,15kg m3 3m, 2,5m, 4m

What is the molarity of a solution that contains 0.400 mol HCl in 9.79 l solution? A. 0.0133 M B. 0.0409 M C. 0.959 M D. 5.67 M