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In-s [12.5K]
3 years ago
13

ASAP for brainlist first correct question

Chemistry
1 answer:
Ghella [55]3 years ago
8 0
The second law of thermodynamics states that in a reversible process, the entropy of the universe is constant, whereas in an irreversible process, such as the transfer of heat from a hot object to a cold object, the entropy of the universe increases
You might be interested in
Why are carbonates often not used in anti acid pills?
Lera25 [3.4K]
Calcium carbonate also is used as an antacid to relieve heartburn, acid indigestion, and upset stomach. It is available with or without a prescription. This medication is sometimes prescribed for other uses. Hope this is the right answer your looking for
6 0
3 years ago
When HCl(g) reacts with NH3(g) to form NH4Cl(s), 42.1 kcal of energy are evolved for each mole of HCl(g) that reacts. Write a ba
stich3 [128]

<u>Answer:</u> The chemical equation is HCl(g)+NH_3(g)\rightarrow NH_4Cl(s)+42.1kCal

<u>Explanation:</u>

There are 2 types of reactions that are classified based on enthalpy change:

  • Endothermic reaction
  • Exothermic reaction

Endothermic reactions: They are defined as the reactions where heat is absorbed by the reaction. The change in enthalpy of the reaction is always positive.

Exothermic reactions: They are defined as the reactions where heat is released by the reaction. The change in enthalpy of the reaction is always negative.

Given values:

Energy released for 1 mole of HCl reacted = -42.1 kCal

The chemical equation for the formation of ammonium chloride follows:

HCl(g)+NH_3(g)\rightarrow NH_4Cl(s)+42.1kCal

8 0
3 years ago
Consider the reaction 4Fe(s) + 3O2(g) --&gt; 2Fe2O3(s) How many grams of oxygen are needed to produce 12.5 g of Fe2O3 (iron(III)
vlabodo [156]

Answer:

3.76 g of O₂ are needed to produced 12.5 g of Fe₂O₃

Explanation:

The reaction is:  4Fe (s) + 3O₂ (g)  →  2Fe₂O₃ (s)

4 moles of iron react to 3 moles of oxygen in order to produce 2 moles of iron (III) oxide.

Let's determine the moles of the produced product.

12.5 g . 1mol/ 159.69g = 0.0783 moles

If we assume Iron in excess, we work with the oxygen.

2 moles of Fe₂O₃ are produced by 3 moles of oxygen

Then, 0.0783 moles of Fe₂O₃ might be produced by (0.0783 . 3)/2

0.117 moles.

We convert the moles to mass → 0.117 mol . 32 g/1mol = 3.76 g

3 0
3 years ago
What is the theoretical yield of calcium phosphate?
BARSIC [14]
  <span>I'm going to assume that the other reactant is sodium phosphate(you did not indicate this) 
so i'm guessing that the reaction did this 
CaCL2 + Na3(PO4) ------------> Ca3(PO4)2 + NaCl 
(since this reaction was done in water(aqueous solutions involved) the NaCl would be in the solution and thus the filtrate of the product so it won't influence the mass of the calcium phosphate product) 

so then you need to write the balanced equation for this reaction(lets assume you can do this) 
3 CaCL2 + 2 Na3(PO4) ------------> Ca3(PO4)2 + 6 NaCl 

so in theoretical analysis 3 moles of calcium chloride is involved in the production of 1 mole of calcium phosphate 

in terms of molar mass equivalents 3 molesw of calcium chloride weigh = 3 x (40 + 71)g/mol = 333g 
1 mole of calcium phosphate = 310 g 
so if you only have 0.513 g of calcium chloride then this would calculate to get the mass of calcium phosphate  
mass = [0.513 / 333] x 310 g = 0.477grams  

your actual yield is what you massed when you performed the lab. hope that helped.
</span>
5 0
3 years ago
Energy flows from the plankton to a number of other organisms when the plankton are eaten. Describe how the decrease in plankton
PIT_PIT [208]
Less plankton would mean that all the organisms that eat plankton would start to die off because they have no source of energy.
7 0
3 years ago
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