How many protons and electrons in Arsenic ion

A graduated cylinder has a mass of 50 g when empty. When 30 mL of water is added, the graduated cylinder has a mass of 120 g. If a rock is added to the graduated cylinder, the water level rises to 75 mL and the total mass is now 250 g.

An ideal gas is in equilibrium at initial state with temperature T=137oC, pressure P = 0.75Pa and volume V = 0.75 m3.

How many ions does sodium have

Which statement is correct? . O The volume of 1 mol of CO2 is greater than that of 2 mol of Oz. The volume of 1 mol of CO2 is greater than that of 1 mol of Nz. The volumes of 2 mol of O2 and 1 mol of N, gases are the same.

Explain how you would find the number of moles of carbon in 4.5 kg of carbon.

The definition of volume is? a) width*height b) the space occupied by mass c) the space occupied by a liquid d) the mass of liquid required to fill a container

What is the empirical formula of a substance that is 53.5% C, 15.5% H, 31.1% N?

What is the lowest layer of the atmosphere and what is its highest altitude?

An atom that has 84 protons and 86 neutrons undergoes a reaction. At the end of the reaction, it has 82 protons and 84 neutrons. What happened to the atom?

A compound of material formed by a chemical is known as?