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Arte-miy333 [17]
2 years ago
13

15. Mass = 25g Start: 45mL Final: 50mL • What is the Volume? • What is the Density?

Chemistry
1 answer:
const2013 [10]2 years ago
3 0
  • Mass=25g
  • Volume=Final volume-Initial volume=50-45=5mL

\\ \star\sf\longmapsto Density=\dfrac{Mass}{Volume}

\\ \star\sf\longmapsto Density=\dfrac{25}{5}

\\ \star\sf\longmapsto Density=5g/mL

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Answer:

The energy difference between these 2p and 2s orbitals is 3.07\times 10^{-19} J

Explanation:

Wavelength of the photon emitted = \lambda =646.3 nm =646.3\times 10^{-9} m

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E=\frac{6.626\tiomes 10^{-34} Js\times 3\times 10^8 m/s}{646.3\times 10^{-9} m}

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3 0
3 years ago
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mash [69]

Answer:

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Step 1: Given and required data

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Step 2: Convert "λ" to meters

We will use the conversion factor 1 m = 10⁹ nm.

433 nm × 1 m/10⁹ nm = 4.33 × 10⁷ m

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We will use the Planck-Einstein's relation.

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E = 6.63 × 10⁻³⁴ J.s × (3.00 × 10⁸ m/s)/4.33 × 10⁷ m

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