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Since one mole is 6.02e23 of any atom, the atomic weight is equal to one mole of any element. For example, one mole of Ca is 40.08, one mole of S is 32.07. Thus being said, one mole of krypton is 83.80!

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Is a noble gas with 48 neutrons and a mass of less than a 100?

The noble gas with 48 neutrons and a mass of less than 100 is Krypton. It has an atomic number of 36, which means it has 36 protons in its nucleus. The total mass of Krypton is slightly less than 100 atomic mass units.


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What volume will 0.405 g of krypton gas occupy at STP?

First we need the moles of krypton gas. Monoatomic gas.0.405 grams Kr (1 mole Kr/83.80 grams)= 0.004833 moles krypton gas======================Now the ideal gas equation.PV = nRT(1 atm)(X volume) = (0.004833 moles Kr)(0.08206 L*atm/mol*K)(298.15 K)= 0.118 Liters of krypton gas--------------------------------------


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