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3 years ago

In a chemical reaction, the mass of the products ____.

2 answers:

5 0

In a chemical reaction, the mass of the products<span> is less than the mass of the reactants.
the first step in most stoichiometry problems is to <span>convert given quantities to moles.

Hope this helps! If it did, pls marky me brainly thank, and 5star me</span>

</span>

Afina-wow [57]3 years ago

3 0

In a chemical reaction, the mass of the products $\boxed{{\text{c}}{\text{. is equal to the mass of reactants}}}$ .

The first step in most stoichiometry problems is to $\boxed{{\text{b}}{\text{. convert given quantities to moles}}}$ .

Further Explanation:

Chemical reaction

When one set of substances are converted to another set by the chemical conversion, it is called chemical reaction. The substances that undergo bond breaking between them and that are initially present are known as reactants. The substances that are finally formed after the completion of chemical reaction are called products. Law of conservation of mass and energy hold good for every chemical reaction.

Law of conservation of mass:

This law states that the mass of an isolated system can neither be created nor be destroyed in a chemical reaction. In other words, the mass of reactants will always be equal to the mass of products.

Therefore, the mass of the products is equal to the mass of reactants.

Stoichiometry is used for determination of amount of different species involved in chemical reaction. It is used to calculate moles of any particular substance if the moles of other substances are known.

The general chemical equation is as follows:

${\text{X}} + 2{\text{Y}} \to 3{\text{Z}}$

Where,

X and Y are reactants.

Z is the product.

Following are the steps to solve stoichiometric problems:

Step 1: The units of substances present in the balanced chemical reaction are converted into moles.

Step 2: The moles of desired substance are calculated with the use of mole ratio.

Step 3: The number of moles of required substance as calculated in the previous step are then converted into the desired units.

Therefore the first step in the solution of stoichiometric problems is to convert the given quantities to moles.

Learn more:

What does conserving mass mean in a chemical reaction? brainly.com/question/2093705
Write the chemical formula of the compound: brainly.com/question/10585691

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Basic concepts of chemistry

Keywords: stoichiometry, moles, law of conservation of mass, chemical reaction, reactants, products, mass, isolated system, created, destroyed. \

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The mole ratio of iron to copper is 1 : 1, thus, 1.31 g of iron is required to produce 1.5 g of copper.

<h3>What is the equation of the reaction between iron and copper(ii) sulfate?</h3>

The reaction between iron and copper(ii) sulfate is a redox displacement reactions in which copper is displaced from its salt by iron.

The equation of the reaction is given below:

$CuSO_4 + Fe \rightarrow FeSO_4 + Cu$

The mole ratio of both reactants and product is 1 : 1

moles = mass/molar mass

molar mass of copper sulfate = 160 g

molar mass of Cu = 64

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moles of Cu in 1.5 g = 1.5/64 = 0.00234

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The absolute uncertainty is approximately 1.69 × 10⁻³

Explanation:

The volume needed for NaOH needed to make the solution = 16.66 ml

The wt% of the added NaOH = 53.4 wt%

The volume of the NaOH to be prepared = 2.00 L

The concentration of the NaOH to be prepared = 0.169 M

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Therefore, 100 g of sample contains 53.4 g of NaOH

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The mass of NaOH in the sample = 0.534 × 25.3232 = 13.5225888 g ≈ 13.52 g

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The number of moles of NaOH = 13.52/39.9971 = 0.3381 moles

Therefore, we have 0.3381 moles in 2.00L solution, which gives;

The number of moles per liter = 0.3881/2 = 0.169045 moles/liter

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