Chemistry, 06.05.2020 05:35 ello17

Consider the following generic chemical reaction:
2A+3B→3C How many moles of B are required to completely react with: 8 mol of A, 9 mol of A, 3 mol of A, and 10 mol of A?

Answers: 2

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Answer from: darlasiller

The number of moles of B reacted in each case is obtained by stoichiometry.

The representation of a chemical process on paper is known as a chemical reaction equation. It must consist of a reactant side and a product side. The reactants combine to yield the product.

Given the reaction; 2A + 3B → 3C, we can see that the mole ratio of the reactants is 2 : 3. Hence;

2 moles of A reacts with 3 moles of B

8 moles of A reacts with 8 moles × 3 moles/2 moles

= 12 moles B

2 moles of A reacts with 3 moles of B

9 mol of A reacts with 9 mol × 3 moles/2 moles

= 13.5 moles of B

2 moles of A reacts with 3 moles of B

3 mol of A reacts with 3 mol × 3 moles/2 moles

= 4.5 moles of B

2 moles of A reacts with 3 moles of B

10 mol of A reacts with 10 mol × 3 moles/2 moles

= 15 moles of B

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Answer from: vbucks72

The number of moles of B that will completely react with;

8 moles of A is 12 moles of B

9 moles of A is 13.5 moles of B

3 moles of A is 4.5 moles of B

10 moles of A is 15 moles of B

Explanation:

From the reaction, we have the mole ratio of the reactants is 2 moles of A combines with 3 moles of B to form 3 moles of C

Therefore, one mole of A which is 2 moles/2 will combine with 3/2 moles of B

Hence 8 moles of A will combine with 8×3/2 or 12 moles of B

9 moles of A will combine with 9×3/2 or 13.5 moles of B

3 moles of A will combine with 3×3/2 or 4.5 moles of B

10 moles of A will combine with 10×3/2 or 15 moles of B

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.