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2 years ago

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

2 answers:

5 0

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.

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

Afina-wow [57]2 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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Anni [7]

Hello!

The half-life is the time of half-disintegration, it is the time in which half of the atoms of an isotope disintegrate.

We have the following data:

mo (initial mass) = 20 g

m (final mass after time T) = 5 g

x (number of periods elapsed) = ?

P (Half-life) = ? (in minutes)

T (Elapsed time for sample reduction) = 8 minutes

Let's find the number of periods elapsed (x), let us see:

$m = \dfrac{m_o}{2^x}$

$5 = \dfrac{20}{2^x}$

$2^x = \dfrac{20}{5}$

$2^x = 4$

$2^x = 2^2$

$\boxed{x = 2}$

Now, let's find the half-life (P) of the radioactive sample, let's see:

$T = x*P$

$8 = 2*P$

$2\:P = 8$

$P = \dfrac{8}{2}$

$\boxed{\boxed{P = 4\:minutes}}\Longleftarrow(Half-Life)\end{array}}\qquad\checkmark$

I Hope this helps, greetings ... DexteR! =)

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2 years ago

In the laboratory you dissolve 13.9 g of potassium phosphatein a volumetric flask and add water to a total volume of 250mL.

tensa zangetsu [6.8K]

Answer:

Molarity of the solution? 0,262 M.

Concentration of the potassium cation? 0,786 M.

Concentration of the phosphate anion? 0,262 M.

Explanation:

Potassium phosphate (K₃PO₄; 212,27 g/mol) dissolves in water thus:

K₃PO₄ → 3 K⁺ + PO₄³⁻ (1)

Molarity is an unit of chemical concentration given in moles of solute (K₃PO₄) per liters of solution.

There are 250 mL of solution≡0,25 L

The moles of K₃PO₄ are:

13,9 g of K₃PO₄ × $\frac{1mol}{212,27 g}$ = 0,0655 moles of K₃PO₄

The molarity of the solution is:

$\frac{0,0655 moles}{0,25L}$ = 0,262 M

In (1) you can see that 1 mole of K₃PO₄ produces 3 moles of potassium cation. The moles of potassium cation are:

0,0655 moles×3 = 0,1965 moles

The concentration is:

$\frac{0,1965 moles}{0,25L}$ = 0,786 M

The moles of K₃PO₄ are the same than moles of PO₄³⁻, thus, concentration of phosphate anion is the same than concentration of K₃PO₄. 0,262 M

I hope it helps!

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