Consider the substances below.

• 1 mol of beryllium
• 1 mol of salt
• 1 mol of water
• 1 mol of hydrogen

which statement is true about these substances?
1) they have exactly the same mass.
2) they have different numbers of particles.
3) they have the same number of atoms.
4) they have different masses.

they have different masses

IS correct!

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have a gg day

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

explanation: