CHEMISTRY HIGH SCHOOL

How many grams are in 11.9 moles of chromium?

Answers

Answer 1

Answer:

Explanation:

It is known that one mole of chromium or molar mass of chromium is 51.99 g/mol.

It is given that number of moles is 11.9 moles.

Therefore, calculate the mass of chromium in grams as follows.

No. of moles = $(mass in grams)/(Molar mass)$

mass in grams = No. of moles × Molar mass

= 11.9 moles × 51.99 g/mol

= 618.68 g

Thus, we can conclude that there are 618.68 g in 11.9 moles of chromium.

Answer 2

Answer:
1mole ----- 52g Cr
11,9moles --- x

x = 11,9*52/1 = 618,8[g]

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As the tempreture of a liquid increases the solubility of a liquid of that liquid

Answers

As the temperature increases, the solubility of the solute in the liquid also increases. This is due to the fact that the increase in energy allows the liquid to more effectively break up the solute. The additoin of energy also shifts the equilibrium of the reation to the right since it takes energy to dissolve most things and you are adding more of it (this is explained with Le Chatlier principles).

I hope this helps and also I assumed that your question involved the solubility of an ionic substance in a solvent like water. If that was not your question feel free to say so in the comments so that I can answer your actually question.

Of these nonmetals, which one is likely to be the least reactive?A. nitrogen (N)
B. phosphorous (P)
C. sulfur (S)
D. oxygen (O)

Answers

Answer: Phosphorous

Explanation: Nitrogen(N): 7: $1s^22s^22p^3$

Phosphorus(P): 15: $1s^22s^22p^63s^23p^3$

Oxygen(O): 8: $1s^22s^22p^4$

Sulphur(S): 16: $1s^22s^22p^63s^23p^4$

As nitrogen contains half filled configuration, it is stable and does not react. Phosphorous lies below nitrogen and reactivity decreases down a group for non metals as they tend to gain electrons as the valence shell move away from the nucleus.

Oxygen has 4 valence electrons, thus it need to gain two electrons to attain stable configuration. Thus is reactive.

Sulphur lies below oxygen and also need to gain two electrons. Reactivity decreases down a group for non metals as they tend to gain electrons as the valence shell move away from the nucleus.

Reactivity increases upward and decreases leftward for these nonmetals. Thus oxygen would be the most reactive since it is the most rightward and upward.

Equation that shows the formula of the reactants and products are called

Answers

Answer:

chemical equation

Explanation:

Calculate the number of atoms needed to balance the following equation: CaCO3+HCl->CO2+H2O+CaCl. (Number 3 on my paper)

Answers

Answer:

CaCO3 + 2HCL -> CO2 +H2O + CaCl2

Explanation:

When balancing an equation, it is important to first ensure that the chemical formulas in the equation are correct. In the above equation, the first modification required is for CaCl to be corrected to CaCl2. This is because the calcium ion has a charge of 2+ which has to be balanced by 2 chloride ions, each of charge 1-

Next, the overall atoms of the equations should be balanced. The number of atoms of each element on the side of reactants should be equal to their number on the side of the products. In this case, the number of HCL molecules should be 2.

Before balancing equation:

Reactants: Ca: 1, C: 1, O: 3, H: 1, Cl: 1

Products: Ca: 1, C: 1, O: 3, H: 2, Cl: 1

After balancing equation:

Reactants: Ca: 1, C: 1, O: 3, H: 2, Cl: 2

Products: Ca: 1, C: 1, O: 3, H: 2, Cl: 2

Your question is wrong CaCl2 is correct
:CaCO3+2HCl---> CO2+ H2O+CaCl2

The hardest known mineral is _____. topaz talc diamond graphite

Answers

Answer: Option (c) is the correct answer.

Explanation:

Moh's scale is used to detect the harness of a mineral. This scale displays harness of 10 minerals.

According to Moh's scale, the hardness of minerals given in the option are as follows:

Topaz = 8
Talc = 1
Diamond = 10

Graphite is not included in Moh's scale.

Thus, we can conclude that the hardest known mineral is diamond.

Diamond. It can only be cut with another diamond.

In the unit cell of galena, six square faces of equal size each form 90 degree angles with every adjacent face. What type of crystal system is this?tetragonal
hexagonal
triclinic
cubic

Answers

Answer : The correct option is, Cubic.

Explanation :

As there are seven types of crystal systems which are cubic, tetragonal, orthorhombic, monoclinic, triclinic, rhombohedral and hexagonal.

A unit cell is characterized by the axial length (a, b and c) and axial angle $(\alpha ,\beta ,\gamma )$ parameters which decide the size and shape of the unit cell.

In tetragonal crystal system, $a=b\neq c$ and $\alpha=\beta=\gamma=90^o$

In hexagonal crystal system, $a=b\neq c$ and $\alpha=\beta=90^o,\gamma=120^o$

In triclinic crystal system, $a\neq b\neq c$ and $\alpha\neq \beta\neq \gamma=90^o$

In cubic crystal system, $a=b=c$ and $\alpha=\beta=\gamma=90^o$

Hence, the correct option is, Cubic.

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H e l p,,, ill give brainliest :)