Hòa tan m gam kim loại Cu trong dung dịch HNO3 loãng, dư. Sau phản ứng thấy thoát ra 4,48 lít khí NO (ở đktc). Tính m ?

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

The size (radius) of an oxygen molecule is about 2.0 ×10−10m. make a rough estimate of the pressure at which the finite volume of the molecules should cause noticeable deviations from ideal-gas behavior at ordinary temperatures (t= 300k ). assume that deviatons would be noticeable when volume of the gas per molecule equals the volume of the molecule itself.

If 2 molecules of one reactant combine with 3 molecules of another to produce 5 molecules of a product, then what is the representation of the reaction?