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sergey [27]
3 years ago
10

What is the purpose of the subscripts, or small numbers, in a chemical formula?

Chemistry
1 answer:
dlinn [17]3 years ago
7 0

Answer: To show the number of atoms present.

Explanation: As in CO² (Carbon dioxide), there is a small 2 next to the symbol "O" (oxygen) to explain that there are two oxygen atoms.

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Read the chemical equation.
Sladkaya [172]

Answer:- D. 1.8 moles of Fe and 2.7molCO_2 .

Solution:- The balanced equation is:

Fe_2O_3+3CO\rightarrow 2Fe+3CO_2

let's first figure out the limiting reactant using the given moles and mol ratio:

1.8molFe_2O_3(\frac{3molCO}{1molFe_2O_3})

= 5.4 mol CO

From calculations, 5.4 moles of CO are required to react completely with 1.8 moles of Iron(III)oxide but only 2.7 moles of CO are available. It means CO is limiting reactant.

Products moles depends on limiting reactant. Let's calculate the moles of each reactant formed for given 2.7 moles of CO.

2.7molCO(\frac{2molFe}{3molCO})

= 1.8 mol Fe

2.7molCO(\frac{3molCO_2}{3molCO})

= 2.7molCO_2

So, the correct choice is D.  1.8 moles of Fe and 2.7molCO_2 are formed.

6 0
3 years ago
PLS HELP!I will give brainliest! When producing hydrogen iodide, the energy of the reactants is 581 kJ/mol, and the energy of th
Veronika [31]

Answer:

Here, we are required to determine the total energy of the reaction and determine if the reaction is an endothermic or exothermic reaction.

The correct answer is option C.

First, we need to determine the energy of the reaction.

The energy of the reaction is the change in enthalpy between the product and reactants.

Change of Enthalpy,

Hreaction = Hproduct - Hreactant.

Therefore, for the reaction above, the change in enthalpy is:

Hreaction = 590kJ/mol - 581kJ/mol.

Hreaction = 9kJ/mol.

Hence, since the reaction has an enthalpy change of 9kJ/mol, the reaction is endothermic (i.e energy is absorbed).

Explanation:

4 0
2 years ago
How many moles of salt will you be using in this recipe?​
user100 [1]
5 molessss booo booo
6 0
3 years ago
The molecular formula for caffeine is C8H10N4O2. Which of the following elements is not found in caffeine?
ANTONII [103]

The correct answer is:

b: Heluim

Explanation:

The caffeine contains: carbon , nitrogen , oxygen , hydrogen.

Caffeine is a primary nervous system energizer of the methylxanthine class. It is the world's most universally consumed psychoactive drug. Unlike many other psychoactive elements, it is fair and unlimited in nearly all parts of the world. Caffeine can be arranged as an alkaloid, a term used for substances originated as end results of nitrogen metabolism in some plants.

5 0
3 years ago
Read 2 more answers
Question # 4 & 5. help CHEMISTRY
laila [671]
1. A thermodynamic quantity that is the difference between the internal energy of a system and the product of itsabsolute temperature and entropy; the capacity of a system to do work, as in an exothermic chemical reaction.<span>2. </span>A thermodynamic quantity that is the difference between the enthalpy and the product of the absolute temperatureand entropy of a system. Also called <span>Gibbs free energy</span>. 
4 0
3 years ago
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