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matrenka [14]
2 years ago
11

What is hydrogen ?,,,​

Chemistry
2 answers:
ASHA 777 [7]2 years ago
6 0

Answer:

Hydrogen is the lightest element in the periodic table. Hydrogen is a gas of diatomic molecules and is colorless, odorless, non-toxic, and highly combustible. It is the most abundant chemical substance in the universe as it constitutes roughly 75% of all normal matter.

Ket [755]2 years ago
5 0

Answer:

It is an odorless, nontoxic, highly combustible substance. It is the chemical substance with the atomic number 1 and the symbol H

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37.1°C.

Explanation:

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<em>∵ ΔHsoln = Q/n</em>

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∴ Q = (n)(ΔHsoln) = (0.0625 mol)(44.51 kJ/mol) = 2.78 kJ.

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Q = m.c.ΔT,

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m is the mass of water (m = 55.0 g, suppose density of water = 1.0 g/mL).

c is the specific heat capacity of water (c = 4.18 J/g.°C).

ΔT is the difference in T (ΔT = final temperature - initial temperature = final temperature - 25°C).

∴ (2781.87 J) = (55.0 g)(4.18 J/g.°C)(final temperature - 25°C)

∴ (final temperature - 25°C) = (2781.87 J)/(55.0 g)(4.18 J/g.°C) = 12.1.

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