Only one if the balloon has enough heilum. You may want to restate the question more succinctly. ans 2 At standard conditions: 22.4 Liters of air weighs approximately 29 grams 22.4 Liters of helium...
The mass the balloons can lift depends on the mass of the air displaced by the balloons. Mass lift-able + mass of balloons = total mass of air displaced. Mass of balloons = Total Volume X Density of...
assuming that temperature is constant and that we're talking about regular party balloons (a "regular" 2-gram party balloon can hold ~ 16 grams of gas), you would need 6,156 baloons to hold your...