1 mol of gas at STP occupy 22,4dm³ (22,4L)
8,482g ------- 2,5L
Xg ------------- 22,4 L
X = 75,999 ≈ 76 g/mol
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13.4 billion years is 3 times of the half-life, 4.47 billion years. So the Uranium-238 will go through three times of half decay. So the remain percentage will be 50%*50%*50%=12.5%.
Answer:
George Washington's presidential term lasted from April 30th, 1789 to March 4, 1797
Fluorine has the highest. Fluorine's electronegativity is 4.0
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