4) 0,3 mol H 2 O chứa bao nhiêu phân tử H 2 O? bao nhiêu nguyên tử H? bao nhiêu nguyên tử O? Trình bày đầy đủ :3

Which statement justifies that phosphine (ph3) is a polar molecule?

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

All cells are made of four types of acids, lipids, proteins, and carbohydrates.