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What is the density of helium gas at 25 degrees Celsius and 760 torr? The answer is 0.16 g/L.

Helium is a very hard atom with a Pearson hardness hard and soft (Lewis) acids and bases of 12.3 eV. It has the lowest polarizability of any kind of atom, however, very weak van der Waals forces exist between helium and other atoms.

Helium, which has a mass of 4.00 g/mol, has a density of 0.164 g/l. Thus, a one-liter balloon of helium can lift a mass of (1.18-0.164) = 1.02 g.

Definition. Standard Temperature and Pressure (STP) is defined as 0 degrees Celsius and 1 atmosphere of pressure.Oct 24, 2020

Standard temperature and pressure (STP) are a useful set of benchmark conditions to compare other properties of gases. At STP, gases have a volume of 22.4 L per mole. The ideal gas law can be used to determine densities of gases.

The mass (m) of 1 mol of He is 4.003 g. Hence, it can be said that the volume (V) of 4.003 g of He at STP is 22400 mL. So, the density of helium at STP is 1.79×10−4g/mL 1.79 × 10 − 4 g / m L .

• Answer: The density of krypton at STP is 3.74 kg/m3, or 0.00374 g/cm3 at STP of 0oC (273.15 K) and 1 atm. The calculated density is 0.0037386 g/cm3.

• Density is defined as the mass per unit volume. In other words, it is how heavy something according to it's size. If something is very heavy and small in size, it means its density is high.

• Hydrogen (density 0.090 g/L at STP, average molecular mass 2.016 g/mol) and helium (density 0.179 g/L at STP, average molecular mass 4.003 g/mol) are the most commonly used lift gases.