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A moon rock collected by a US Apollo mission is estimated to be 4.40 billion years old by uranium/lead dating. Assuming that the rock did not contain any lead when it was formed, what is the current mass of 206Pb in the rock, it currently contains 1.595 g of 238U? The half-life of 238U is 4.47x10^9 years. 206Pb mass: __g