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when a substance is boiled, what happens to the mass?

the mass increases as it changes from a liquid to a gas.
the mass stays constant as it changes from a liquid to a gas.
there is no mass once the substance becomes a gas.
the mass decreases as it changes from a liquid to a gas.

The mass stays constant as a substance changes from a liquid to a gas.  

The Law of Conservation of Mass states that, in ordinary chemical reactions, mass is neither destroyed nor created.

That is, the mass of the reactants must equal the mass of the products.

2H₂O(ℓ) ⟶ 2H₂O(g)

   1 g              1 g

If the mass of liquid water is 1 g, the mass of the water vapour must be 1 g.

Even though the water vapour is a gas and you can’t see it, it still has a mass

of 1 g.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.