can we float if inflateable suit are filled with a ton of helium?

Question

yes or no
please explane

Answer 1

What exactly do you mean by, "a ton" of Helium?
A ton is a unit of measure, so perhaps you were specifying a specific amount of Helium. Then again, that phrase can also be used to indicate a large, indeterminate, amount as well.

In any case, in order to get an object to float, one needs to at very least get the net force acting on the object to be zero (or better yet pointing upward so as to lift you off the ground).
To do this, one must use a buoyant force which is equal to or exceeds the object's weight.
The magnitude of the buoyant force depends upon the (in this case) lighter than air gas one is using and the conditions (temperature, pressure) one is using it in.

The lifting power of Helium is due to the fact that for a given volume, Helium is lighter than air. The difference in the gasses’ weights equals the buoyant force.
At STP, air has a density of about 1.296 g/L while Helium’s density is only about .178 g/L, given Helium the ability to lift about 1.2 grams per Liters.
By knowing the object’s mass (including the mass of container holding the Helium) one can calculate just how much Helium it would take to lift a person.

For example,
For someone with a weight of 75 kg (165 lb.), it would take about 62500 Liters of Helium to lift them, minimally, at STP.