How many atoms of hydrogen (h) are present in 200 molecules of ammonia (nh3)? express your answer numerically?

What is the mass of 0.46 mil of mgcl2

Which fact represents evidence for the big bang theory?

Pastoral farming is best described as a. a method of raising livestock and moving herds b. an african method of agriculture c. a method of cultivating crops on poor soils d. a common method of desert farming select the best answer from the choices provided a b c d