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borishaifa [10]
3 years ago
9

You place a mass of 250 grams on the measurement tray of a triple beam balance and then set the rider on the 500 gram beam to th

e 200 gram mark (the other riders are set to 0 grams).
Chemistry
1 answer:
katen-ka-za [31]3 years ago
8 0
<span>The pointer will be above the zero mark</span>
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The element lead (Pb) consists of four naturally occurring isotopes with masses of 203.97302, 205.97444, 206.97587, n 207.97663
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Answer:

The atomic mass of lead is: 207.216 u

Explanation:

data                 Isotopes                     mass                      percent

                             1                      203.97302                      1.4

                             2                     205.974444                    24.1

                            3                      206.97587                       22.1

                            4                      207.97663                       52.4

atomic mass = (203.97302x 0.014) + (205.974444 x 0.241) +

                        (206.97587 x 0.221) + (207.97663 x 0.524)

atomic mass = 2.856 +49.639 + 45.742 + 108.979

atomic mass = 207.216 u

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Hear n = 1000 to n = 2 pairs of quantum states of hydrogen has the biggest energy difference between the states

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