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kherson [118]
3 years ago
5

When 0.875 g. of magnesium was heated in air, 1.25 g. of magnesium oxide

Chemistry
1 answer:
Ilia_Sergeevich [38]3 years ago
3 0

Answer:

1. What is the coefficient for calcium in the balanced equation?

2 Ca + 5 NaOH → 4 Na + 2 Ca(OH)2

2. The burning of 20.0 g of acetylene (C2H2) produces what mass of carbon dioxide? You must

write the equation, balance it and solve the mass-mass problem.

a. Balanced equation:

2 C2H2 + 5 O2  4 CO2 + 2 H2O

Explanation:

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How many photons are produced in a laser pulse of 0.364 J at 477 nm?
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Answer:

1.00 × 10¹⁸

Explanation:

1. Calculate the <em>energy of one photon</em>

The formula for the energy of a photon is

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2. Calculate the <em>number of photons</em>

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An atom that undergoes radioactive decay and has a large nucleus most likely contains..
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