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Zielflug [23.3K]
3 years ago
14

The thikness of an eye lash is 15 mm how much this will be in meters ? write it in scientific Notation.

Chemistry
1 answer:
deff fn [24]3 years ago
6 0

Answer

1.5x10^-3 m

24.91x10^5

Explanation:

15 millimeters

- 1 mm = .0015

exponent indicates which way the decimal moved and to how many places

we moved the decimal backwards (negative) 3 spaces

2491 km= 2491000 m

exponent indicates which way the decimal moved and to how many places

we moved the decimal forwards (positive) 5 spaces

2491000.00 --> 24.91000

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Use bond energies to calculate δhrxn for the reaction. n2(g)+3cl2(g)→2ncl3(g)
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ΔHrxn = ΣδΗ(bond breaking) - ΣδΗ(bond making)

Bond enthalpies,
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According to the balanced equation,
ΣδΗ(bond breaking)  = N ≡ N x 1 + Cl - Cl x 3
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ΣδΗ(bond making)    = N - Cl x 3 x 2
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δHrxn = ΣδΗ(bond breaking) - ΣδΗ(bond making)
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3 years ago
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Dalton's law of partial pressures states that the total pressure exerted by a mixture of gases is the sum of the pressures exert
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Answer: The given statement is true.

Explanation:

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The relationship is as follows.

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or,        p_{total} = p_{1} + p_{2} + p_{3} + p_{4} + ......... + p_{n}

where,  p_{1}, p_{2}, p_{3} ....... = partial pressure of individual gases present in the mixture

Also, relation between partial pressure and mole fraction is as follows.

                 p_{i} = p_{total} \times x_{i}

where,      x_{i} = mole fraction

Thus, we can conclude that the statement Dalton's law of partial pressures states that the total pressure exerted by a mixture of gases is the sum of the pressures exerted independently by each gas in the mixture, is true.              

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3 years ago
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