How do i write a report about Gold mining?

1 answer:

4 0

Your Essay Must include:
Introduction:Brings the main idea,Must be atleast 3 sentences.
Body/Details:Supports the main Idea,Must be atleast 8 sentences.
Body/Details(Optional):Supports the main Idea,Must be atleast 8 sentences.
Conclusion:Tells a little more information.

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30 g of hydrogen reacts with 120 g of oxygen to form water.How much water is produced?

Rus_ich [418]

According to law of conservation of mass.

In a chemical reaction Mass is neither created nor destroyed.

Mass of product =Mass of reactant

Mass of water

$\\ \sf\longmapsto 30+120=150g$

Mass of sulphur:-

$\\ \sf\longmapsto 136.9-111.6=25.3g$

6 0

3 years ago

If 3. 5 grams of ni are reacted with excess oxygen to form nickel oxide unser standard state conditions, what is the entropy cha

Mashutka [201]

Entropy Change is the measure of the randomness of the thermodynamic system. The entropy change for the reaction is -49.3 J/K.

<h3>What is the change in entropy?</h3>

Entropy change is the ratio of the heat transfer of the system to the absolute temperature of the system.

The entropy of nickel = 182.1 J/mol. K

The entropy of oxygen = 205.0 J/mol. K

The entropy of nickel oxide = 37.99 J/mol. K

Entropy change is calculated as:

$\begin{aligned}\Delta \rm S &= 2(37.99)-2(182.1)-205\\\\&= 75.98 - 364.2 - 205\\\\&= -493.22 \end{aligned}$

Therefore, -49.3 J/K is the entropy change.

Learn more about entropy change here:

brainly.com/question/1301642

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8 0

2 years ago

If you have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, which element is the reactant in excess? 3H2 +

kicyunya [14]

Answer:

nitrogen

Explanation:

The stoichiometry of the reaction says that $H_{2}$ and $N_{2}$ react 3:1 to form 2 moles of $NH_{3}$ , so, if you have 3,5 moles of H, which is equal to 1,75 moles of $H_{2}$ , and 5 moles of N, which are equal to 2,5 moles of $n_{2}$ . only $\frac{1,75 moles of H2}{3}$ =0.583 moles of $N_{2}$ , will react, leaving 1.917 moles of $N_{2}$ unreacted, and forming 0.583*2=1.166 moles of $NH_{3}$