Question

In a chemical reaction, the mass of the products ____.
a. is less than the mass of the reactants
b. is greater than the mass of the reactants
c. is equal to the mass of the reactants
d. has no relationship to the mass of the reactants ____ 12. the first step in most stoichiometry problems is to ____.
a. add the coefficients of the reagents
c. convert given quantities to volumes
b. convert given quantities to moles
d. convert given quantities to masses

Answer 1

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

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Answer 2

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:

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