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lbvjy [14]
3 years ago
8

What is the total number of neutrons in the nucleus of a neutral atom that has 19 electrons and a mass of 39?

Chemistry
1 answer:
JulsSmile [24]3 years ago
3 0
20 because
mass no=electrons+neutrons
so to find neutrons
mass no-electrons=neutron
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Jordan's puppy has a mass of 5480 milligrams , what is the puppy's mass in grams ?
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5480×10^-2

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How many grams of water can I convert from a liquid to a gas with 6768 joules?
vredina [299]

Answer:

The amount of water converted from liquid to gas with 6,768 joules is approximately 3.035 g

Explanation:

The amount of heat required to convert a given amount of liquid to gas at its boiling point is known as the latent heat of evaporation of the liquid

The latent heat of evaporation of water, ΔH_v ≈ 2,230 J/g

The relationship between the heat supplied, 'Q', and the amount of water in grams, 'm', evaporated is given as follows

Q = m × ΔH_v

Therefore, the amount of water, 'm', converted from liquid to gas at the boiling point temperature (100°C), when Q = 6,768 Joules, is given as follows;

6,768 J = m × 2,230 J/g

∴ m = 6,768 J /(2,230 J/g) ≈ 3.035 g

The amount of water converted from liquid to gas with 6,768 joules = m ≈ 3.035 g.

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