How many moles of hydrogen gas are contained in 21.3 l at stp?

To get the moles of hydrogen gas, we will use the molar volume equation, where 1 mole of any ideal gas occupies a volume of 22.4 L. This was derived using the ideal gas law equation;

PV=nRT , where

P - Pressure of the gas

V - Volume occupied by the gas 

n - number of moles of gas present

R - universal gas constant, usually given as 0.0821atm⋅Lmol⋅

T - absolute temperature of the gas

STP conditions are defined as a pressure of 1 atm and a temperature of 273.15 K.

PV=nRT

they emit helium gas that attaches to nearby planets.

they remove low-mass elements from the planets’ crust.

they cause nuclear fusion inside the inner core of planets.

they produce heavy elements such as iron and gold.

explanation:

fire could start, buildings collapsing, and ash falling from the sky.

explanation:

this is because the buildings or plants could catch on fire and the buildings would most likely collapse. lastly ash would fall because all the burning would cause ash to fall from the sky.

hope this .