Asteroids are made of rock, metals, and other elements. Some even contain water. Asteroids that are mostly stone sometimes are more likely to lose piles of rubble. Asteroids that are mostly iron are more rock-solid.

Explanation:

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3 years ago

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What is the molarity (M) of 1 liter of a solution that has 120 g of NaCl dissolved in it?

Ainat [17]

Answer:

The answer to your question is 2.1

Explanation:

Data

Molarity = 1 l

mass = 120 g of NaCl

moles = ?

Formula

$Molarity = \frac{number of moles}{Volume}$

Process

1.- Calculate the number of moles of NaCl

Molecular weight NaCl = 23 + 35.5 = 58.5 g

2.- Calculate the number of moles using proportions

58.5 g of NaCl --------------- 1 mol

120.0 g of NaCl --------------- x

x = ( 120 x 1) / 58.5

x = 2.1 moles

3.- Calculate Molarity

Substitution

$Molarity = \frac{2.1}{1}$

Simplification and result

Molarity = 2.1

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Pure water at 25°C

Vika [28.1K]

Answer:

The last statement describes the correct inozation of water:

Pure water at 25ºC:

self-ionizes to form an equilibrium system in which:

$[H_3O^+]=[OH^-]=10^{-7}moles/liter$

Explanation:

It has been proven that pure water slightly conducts electricity. This fact, explained by the Arrhenius model of acids, would mean that pure water contains ions.

Since such ions are spontaneoulsy produced by the water molecules, this phenomenum is called self-ionization of water.

The equilibrium equation that represents the self-ionization of water is:

$H_2O(l)+H_2O(l)\rightleftharpoons H_3O^+(aq)+OH^-(aq)$