Tính nồng độ đương lượng của dung dịch H3PO4 (phản ứng như axit ba nấc). Biết trong 250ml dung dịch có 32,66g H3PO4.

Find the protons, electrons and neutrons for strontium with a mass of 83

Which one of the following gases is not an important component of soil?

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?