2 years ago

Which chemical symbol describes an element? o H2O o 02 o CH4 o H2 SO4

Chemistry

2 answers:

ra1l [238]2 years ago

4 0

H20 is the answer to your question

navik [9.2K]2 years ago

4 0

Answer:

H20

Explanation:

. It is a symbol of water where H = Hydrogen, O = Oxygen and2 Elements in hydrogen and 1 element in oxygen;therefore its known as H2O.

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If a gas is cooled from 315K to 231K and the volume is kept constant, what would the final pressure be if the original pressure

goblinko [34]

Answer:

455.4 mmHg

Explanation:

To solve this problem we can use Gay Lussac's Law, which describe the temperature and pressure of a gas, at constant volume and composition:

P₁T₂ = P₂T₁

In this case:

P₁ = 621 mmHg

P₂ = ?

T₁ = 315 K

T₂ = 231 K

We input the data:

621 mmHg * 231 K = P₂ * 315 K

And solve for P₂:

P₂ = 455.4 mmHg

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gizmo_the_mogwai [7]

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3 years ago

How sig figs are in 28.0

Nadya [2.5K]

There are exactly (a). 10.0 and (b). 28.0

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3 years ago

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Gre4nikov [31]

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6 0

2 years ago

What is an isotope? list the isotopes of hydrogen in order from lighter to heavier. which is the most common among them?

malfutka [58]

Isotopes= a group of atoms with the same no. of protons , but different no. of neutrons

Hydrogen isotopes

$^1H\implies ^2H\implies ^3H$

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2 years ago