<span>1.91 mol H2
Let's rewrite that equation into a balanced equation. Let's start with the unbalanced version:
Na + HF ==> NaF + H2
We have equal amounts of Na and F on both sides, but twice as much H on the right. So let's double the Na, HF, and NaF coefficients.
2Na + 2HF ==> 2NaF + H2
And we now have equal quantities of all elements on both sides, so our equation is balanced.
Now looking at the balanced equation, 2 moles of sodium should produce 1 mole of hydrogen gas. So we should have 4.50/2 = 2.25 moles of hydrogen gas. But we only have an 85% yield, so we multiply the expected yield by the percentage, giving 2.25 mol * 0.85 = 1.9125 mol. Rounding to 3 significant figures gives us 1.91 mol which matches "1.91 mol H2"</span>
Answer:
hydrogen is a chemical element with the symbol age in atomic number one with a standard atomic weight of 1.008 hydrogen is the lightest element in the periodic table hydrogen is the most abundant chemical substance in the universe constituting roughly 75% of all baryonic Mass
Decreasing the separation between the two magnets will result in increase in the magnetic force between two magnets.
<h3>What is a Magnet?</h3>
This is referred to a substance which produces magnetic field and result in the attraction and repulsion of certain types of things.
Increase in the separation will reduce the magnetic force and vice versa which is why option A was chosen.
Read more about Magnet here brainly.com/question/14997726
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Answer:
7.00 g
Explanation:
There is some information missing. I think this is the complete question:
<em>Wine goes bad soon after opening because the ethanol CH₃CH₂OH in it reacts with oxygen gas O₂ from the air to form water H₂O and acetic acid CH₃COOH, the main ingredient of vinegar. What mass of ethanol is consumed by the reaction of 4.86g of oxygen gas? Round your answer to 3 significant digits.</em>
<em />
First, we have to write the balanced equation.
CH₃CH₂OH + O₂ ⇒ CH₃COOH + H₂O
Then, we can establish the following relations:
- The molar mass of O₂ is 32.0 g/mol
- The molar ratio of O₂ to CH₃CH₂OH is 1:1
- The molar mass of ethanol is 46.1 g/mol.
The mass of ethanol that reacts with 4.86 g of oxygen is:
Answer:
The ranking order of the degree of polarity is HF>HCl>HBr>HI
Explanation:
The degree of polarity of a compound depends on the nature electronegative atom that it contains.
Among Fluorine,chlorine,bromine and iodine the electronegativity of fluorine is highest among all the mentioned atoms.
Due to high electronegativity HF is the most polar than HCl,HBr and HI and the HI have least polarity as its atomic structure is large and electronegativity is lower than fluorine,chlorine and bromine.
