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chubhunter [2.5K]
3 years ago
12

Hydrogen and oxygen combine in the ratio of 1:8 by mass to form water. How many grams of hydrogen are needed to react completely

with 6.4 g of oxygen gas? Show complete working. Which law of chemical combination will govern your answer? Write the law.
Chemistry
1 answer:
kondor19780726 [428]3 years ago
7 0

Explanation: Number of moles of water = mass of water/ molar mass.  

Molar mass of H2O = (1*2) + 16 = 18.0  

 Now we only need to calculate the number of moles of water.  

The chemical reaction is as follows  

CH4 + 2O2 ---> CO2 + 2H2O  

From the eqn, the moles of H2O = 2*moles of CH4  

Molar mass of CH4 = 12 + 4 = 16. Number of moles of methane = mass/

molar mass.   No of moles = 6.4/16 = 0.4.  So the number of mole of water = 2* 0.4 = 0.8. We already calculate its molar mass earlier.  So mass of water = molar mass * number of moles = 18 * 0.8 = 14.4

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In humans, infections by fungi and protists are usually more difficult to treat than bacteria infections. Suggest an explanation
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5 0
3 years ago
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How many metals, nonmetals and metalloids are there in the periodic table?
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6 0
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The building block of a nucleic acid, consisting of a five-carbon sugar covalently bonded to a nitrogenous base and a phosphate
Romashka-Z-Leto [24]

Answer:

Nucleotides

Explanation:

Nucleotides are the organic molecules which serve as monomer units for the formation of nucleic acid polymers which are the deoxyribonucleic acid and the ribonucleic acid (RNA) and both are the essential biomolecules within the life on the Earth.

Nucleotides are building blocks of the nucleic acids. They are the molecules which are composed of three sub units which are:  

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  • Five-carbon sugar  which can be ribose or deoxyribose
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8 0
3 years ago
A cylinder with a moving piston expands from an initial volume of 0.250 L against an external pressure of 2.00 atm. The expansio
kondor19780726 [428]

Answer:

The final volume of the cylinder is 1.67 L

Explanation:

Step 1: Data given

Initial volume = 0.250 L

external pressure = 2.00 atm

Expansion does 288 J of work on the surroundings

Step 2: Definition of reversible work:

Wrev = -P(V2-V1) = -288 J

The gas did work, so V2>V1  (volume expands) and the work has a negative sign.(Wrev<0)

V2 = (-Wrev/P)  + V1

⇒ with Wrev = reverse work (in J)

⇒ with P = the external pressure (in atm)

⇒ with V1 = the initial volume

We can see that your pressure is in  atm  and energy in J

To convert from J to L * atm we should use a convenient conversion unit using the universal gas constants :

R = 8.314472 J/mol *K and R= 0.08206 L*atm/K*mol

V2 =- (-288 J * (0.08206 L*atm/K*mol  /8.314 J/mol *K))/2.00 atm  + 0.250L

V2 = 1.67 L

The final volume of the cylinder is 1.67 L

8 0
3 years ago
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