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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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43.0 + 50.0 + 16.0= please answer with right amount of significant figures
zzz [600]

Answer:

109.0

Explanation:

When adding or subtracting values, you must round your answer to the same "place" as the measurement with its last significant figure <em>furthest to the left</em>.  

That is, you round off to the same number of decimal places as the measurement with the <em>fewest decimal places</em>.

43.<u>0 </u>

50.<u>0</u>

<u>+16.0 </u>

109.<u>0</u>

In each measurement, the “0” is the significant figure furthest to the left, so you round off the number to the “tenths" place. That's the last column that the measurements share.

109.0 → 109.0 (rounded to the “tenths” place)

In other words, you do not round off, and the sum has four significant figures.

8 0
3 years ago
Anybody wanna help?????
boyakko [2]

Answer:

straight line down then left and right that should be it

Explanation:

7 0
3 years ago
How much did shell erosion increase between 1995 and 2020?
saveliy_v [14]

The mussel shell erosion increased by 30 percent points between 1995 and 2020.

<h3>What is erosion?</h3>

Erosion is the washing away of the top layer of a substance or material.

The mussel shell erosion is a type of erosion which occurs in mussel shell as a results of chemical changes that occur on their environment.

The mussel shell erosion is shown on the graph.

Therefore, based on the graph, mussel shell erosion increased by 30 percent points between 1995 and 2020.

Learn more about erosion at: brainly.com/question/12759847

#SPJ1

5 0
2 years ago
Who is good at chemistry?! HMU asap!!!​
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Id say i’m good i guess. send links for the brainly problems u need help with!
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A recipe calls for 1.2 cups of oil. How many liters of oil is this?
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