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3 years ago

Calculate the percent by mass of 4.35g of Na I dissolved in 105g of water

Chemistry

1 answer:

Ludmilka [50]3 years ago

4 0

<u>We are given:</u>

Mass of Na added = 4.35 grams

Mass of water = 105 grams

<u>Mass Percent of Na:</u>

Total mass of the solution = mass of solute + mass of solvent

Total mass of the solution = 4.35 + 105 = 109.35 grams

Mass percent of solute = (mass of solute / mass of solution) * 100

Mass percent of Solute = (4.35 / 109.35) * 100

Mass percent = 3.978 %

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Consider the reaction of magnesium metal with hydrochloric acid to produce magnesium chloride and hydrogen gas. if 4.40 mol of m

Georgia [21]

The balanced chemical equation for the above reaction is as follows ;
Mg + 2HCl —> MgCl2 + H2
The stoichiometry of Mg to HCl is 1:2
This means that 1 mol of Mg reacts with 2 mol of HCl
Equal amounts of both Mg and HCl have been added. One reagent is the limiting reactant and other reactant is in excess.
Limiting reactant is the reagent that is fully used up in the reaction and the amount of Product formed depends on the amount of limiting reactant present.
In this reaction if Mg is the limiting reactant, 4.40 moles of Mg should react with 4.40x2 -8.80 moles of HCl.
But only 4.40 moles of HCl present therefore HCl is the limiting reactant that reacts with 4.40/2 = 2.20 moles of Mg
Stoichiometry of HCl to MgCl2 is 2:1
Since HCl moles reacted -4.40 mol
Then MgCl2 moles formed are 4.40/2 = 2.20 mol of MgCl2

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4 years ago

Look at the products of the chemical reaction to determine if the reactant added to water caused an acid reaction, a base reacti

Feliz [49]

1. The reaction is a neutralization reaction

2. The reactant added to the water causes an acid reaction

3. The reactant added to the water causes a base reaction

4. The molarity of the solution is 0.025 M

<h3>What is a neutralization reaction? </h3>

This is a reaction involving an acid and a base which result in the formation of salt and water only

HF + NaOH –> H₂O + NaF

The reaction above indicates neutralization since the reaction produces water (H₂O) and salt (NaF) only

An acid is a substance which dissolves in water to produce hydronium ion H₃O⁺

3HI + 2H₂O —> 2H₃O⁺ + 3I¯ + H⁺

The reaction above is an acid reaction since it produces H₃O⁺

A base is a substance which dissolves in water to produce hydroxide ion OH¯

2CH₃COO¯ + H₂O —> CH₃COO¯ + OH¯ + CH₃COOH

The reaction above is a base reaction since OH¯ is produced.

<h3>How to determine the molarity </h3>

Mole = 0.05 mole
Volume = 2 L

Molarity =?

Molarity = mole / Volume

Molarity = 0.05 / 2

Molarity = 0.025 M

Learn more about molarity:

brainly.com/question/9468209

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2 years ago

Question 2 of 10

professor190 [17]

Answer:

It's the button with the x, and a blank box above it.

Explanation:

Check the attachments, you'll see what it looks like. It will probably look different on your calculator, but the icon should be the same or similar.

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2 years ago

(a) The bonding with electrostatic attraction between oppositely charged ions is called . The bonding with electron sharing betw

AVprozaik [17]

Answer:

a) Ionic bonding

Covalent bonding

Metallic bonding

b) Electrons with the same state must have opposite spins.

Electron state can hold no more than two electrons.

Explanation:

a) When an atom loses electrons it became a cation, with a positive charge, and when an atom gain electrons it became an anion, with a negative charge. Because of the attraction of the opposite charges, the ions form a bond, which is called ionic bonding.

When atoms share electrons to complete the octet rule, they form a molecule by covalent bonding.

When a metal loses its valence electrons, they form a "sea of electrons" and the cations are "glued" by them, which is called metallic bonding.

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3 years ago

What is the percent by mass of sulfur in sulfur dioxide?a.32b.33c.50d.67?

-BARSIC- [3]

Molar mass of sulfur dioxide (SO2) is 64.066g/mol
molar mass of sulfur is 32.065 g/mol
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3 years ago

Calculate the percent by mass of 4.35g of Na I dissolved in 105g of water​

Calculate the percent by mass of 4.35g of Na I dissolved in 105g of water