Volume is defined as the amount of mass that an object has. true false

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?

The volume of a single vanadium atom is 9.29×10-24 cm3. what is the volume of a vanadium atom in microliters?