CHEMISTRY HIGH SCHOOL

Given the balanced equation representing a reaction:2C2H6 + 7O2==>4CO2 + 6H2O

Determine the total number of moles of oxygen that react completely with 8.0 moles of C2H6.

Answers

Answer 1
Answer:

The number of moles of O₂ will be 28 moles.

The given balanced reaction:

2C_2H_6 + 7O_2==>4CO_2 + 6H_2O

From the above reaction,

2 moles of C₂H₆ nd 7 moles of O₂ reacts together to produce 4 moles of CO₂ and 6 moles of H₂O.

Given:

Number of moles of C₂H₆ = 8

To find:

Number of moles of O₂=?

2 moles of C₂H₆  reacts with 7 moles of O₂.

1 mol of C₂H₆ = (7)/(2) moles of O₂

8 moles of C₂H₆  = (7)/(2) *8 moles of O₂

Thus, number of moles of O₂ will be 28 moles.

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For the reaction: 2H2O2 --> 2H2 + 2O2, what is the total number of moles of O2 produced from the complete decomposition of 8 moles H2O2? A) 2 moles B) 4 moles C) 8 moles D) 16 moles
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0.5 grams of sodium chloride is dissolved to make 0.05 liters of solution. How do I solve this?

Answers

The concentration of the solution has been 0.17 M.

The molarity has been defined as the moles of solute that has been dissolved in a liter of solution. The molarity of the solution has been expressed as:

\rm Molarity=(Mass)/(Molar\;mass)\;*\;(1)/(Volume\;(L))

Computation for Molarity of the solution

The molar mass of sodium chloride solution has been 58.5 g/mol.

The given mass of NaCl in the solution has been 0.5 grams.

The volume of NaCl solution has been 0.05 L.

Substituting the values for molarity of the solution:

\rm Molarity=(0.5)/(58.5)\;*\;(1)/(0.05\;L)\n\nMolarity=0.17 M

The concentration of the solution has been 0.17 M. The solution has been prepared by dissolving 0.5 g NaCl in minimal water, and makeup the volume to 0.05 L.

Learn more about molarity, here:

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If you are trying to find the molarity of this solution you first need to find the number of moles of sodium chloride that are present in the 0.5g sample.  To do this you need to divide the mass of sodium chloride (0.5g) by its molar mass (58.45g/mol) to get 0.00855mol of sodium chloride.  Then you divide the number of moles (0.00855mol) by the volume of solution (0.05L) to get 0.171M (The units for molarity is mol/L).  Therefore the solution has a concentration of 0.171M.

I hope this helps.  Let me know in the comments if anything was unclear or if you were asking a different question.

**98 POINTS** Given 1.00 gram of (NH4)2 CO3, how many grams of this sample would be due to hydrogen?

Answers

OP already did it - CONGRATS!!

here are the steps 2 get the same ans:

(NH4)2 CO3 has 2x N, 8x H, 1x C and 3x O per molecule

so its molecular mass = 2x14 + 8x1 + 1x12 + 3x16

=28+8+12+48

=96g

of that 96g, 8x1=8g is due to Hydrogen

so by ratio n proportion, 1.00g will have 1x8/96 = 1/12g = 0.083g of H

Which is a characteristic of a weak electrolyte?

Answers

Answer:

They are feebly dissociated when dissolved in a solvent.

Explanation:

The electrolyte is a substance which dissociate into cations and anions when dissolved in a solvent.

The strong electrolyte is almost 100% dissociated.

The following are the characteristics of weak electrolyte.

a) they are weakly dissociated

b) they have low degree of dissociation (alph)

c) they have low value of dissociation constant (less than 0.001, generally).

d) they dissociate incompletely and there is dissociation increases with increase in dilution.
Electrolytes are substances which, when dissolved in water, break up into cations (plus-charged ions) and anions (minus-charged ions). We say they ionize. Strong electrolytes ionize completely (100%), whileweak electrolytes ionize only partially (usually on the order of 1–10%).

The empirical formula of a compound is found to be P2O5. Experiments show that the molar mass of the compound is 426g/mol. What is the molecular formula of the compound?Answer: P4O10

Answers

Answer:

Molecular formula = P₄O₁₀

Explanation:

Given data:

Empirical formula of compound = P₂O₅

Molar mass of compound = 426 g/mol

Molecular formula = ?

Solution:

Molecular formula:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Empirical formula mass=  P₂O₅  = 283.89 g/mol

n = 426 g/mol / 283.89 g/mol

n = 2

Molecular formula = n (empirical formula)

Molecular formula = 2 (P₂O₅ )

Molecular formula = P₄O₁₀

making predictions, categorizing things, spotting something unusual, identifying themes, discovering connections, finding patterns are all apart of?

Answers

Monopoly GO! bye bye guys i gtg

After the collapse of a nebular cloud, atoms begin gravitating together to form a condensed center. What happens next in the star formation process?

Answers

Answer:

Depending upon the mass gathered, the next process formation varies:

Nuclear fusion can kick in leading to formation of star. The nuclei fuse to together and energy is liberated in the form of light and heat.

If sufficient mass is not gathered to start nuclear fusion reaction, gaseous planet forms like Jupiter.

In third case, even though sufficient mass is present (twice the mass of Jupiter) still no fusion reaction starts. Such bodies are known as failed stars or brown dwarfs.


After the collapse of a nebular cloud and atoms begin gravitating together to form a condensed center, what happens next in the star formation process is that the compression and collapse of the star stops if it is hot and dense enough. It becomes a "protostar".
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