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Ber [7]
3 years ago
8

I find that there are 500 atoms of U-235 and 1500 atoms of Pb-207. If we assume the mineral contained only parent and no daughte

r, then how many atoms of these elements were in the mineral when the rock first formed?
Chemistry
1 answer:
swat323 years ago
3 0

Explanation:

From the question it can be infered that initially only parent atoms were present in the rock and  no daughter atom. So, initially there was only uranium atom and no lead atom. So, in total there were 500+1500= 2000 uranium atom. And no lead tom was there.

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1.26 * 10^4 + 2.50 * 10^4 in sceintific notation
eduard
Hello! I can help you with this. First, convert them into it’s written out standard form. 10^4 is 10,000. 10,00 * 1.26 is 12,600. 10,000 * 2.5 is 25,000. 12,600 + 25,000 = 37,600 or 3.76 * 10^4 in scientific notation. The answer in scientific notation is 3.76 * 10^4.
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Explain why BH3 is trigonal planar and NH3 is trigonal pyramidal.
Troyanec [42]

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Explanation:

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3 years ago
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nikklg [1K]

Answer:

CH3OH and NADH

Explanation:

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Len [333]

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8 0
4 years ago
Read 2 more answers
I need help with B and C
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