Answer: 2Na + 2H₂O → 2NaOH + H₂
According to the equation, 2 moles of Na react with 2 moles of H₂O to produce 1 mole of H₂ gas.
To calculate the number of moles of Na in 120 g, we need to know the molar mass of Na, which is 22.99 g/mol. We can set up a conversion factor:
120 g Na * (1 mol Na / 22.99 g Na) = 5.22 mol Na
Since the reaction ratio is 2 moles of Na to 1 mole of H₂, we can set up another conversion factor:
5.22 mol Na * (1 mol H₂ / 2 mol Na) = 2.61 mol H₂
Now, to convert moles of H₂ to grams of H₂, we need to know the molar mass of H₂, which is 2.02 g/mol. Again, we set up a conversion factor:
2.61 mol H₂ * (2.02 g H₂ / 1 mol H₂) = 5.27 g H₂
Therefore, when 120 g of Na reacts with water, approximately 5.27 grams of hydrogen gas will be produced.
Note: Remember to round your final answer to an appropriate number of significant figures based on the given data.
Explanation:
To find the grams of hydrogen produced, we need to calculate the moles of Na, determine the moles of H2O using the mole ratio, and convert the moles of H2 to grams.
To determine how many grams of hydrogen are produced when 120 g of Na is available, we first need to calculate the moles of Na using its molar mass. Then, we use the balanced chemical equation to determine the mole ratio between Na and H₂O. Finally, we convert the moles of H₂ to grams. Here are the steps:
1. Calculate the moles of Na:
moles of Na = (mass of Na) / (molar mass of Na)
2. Determine the moles of H₂O using the mole ratio:
moles of H₂O = (moles of Na) x (moles of H₂O / moles of Na)
3. Convert the moles of H₂ to grams:
grams of H₂ = (moles of H₂) x (molar mass of H₂)
Using these steps and the given values, we can calculate the grams of hydrogen produced from 120 g of Na.
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The volume of the rock is 7mL. The correct option is c)7ml
From the question,
We are to determine the volume of the rock.
When an object is submerged in a container containing a liquid, the submerged object displaces a volume of liquid equal to the volume of the object.
That is,
Volume of object = Final volume - Initial volume
From the given information,
Initial volume = 40mL
Final volume = 47mL
∴ Volume of the rock = 47mL - 40mL
Volume of the rock = 7mL
Hence, the volume of the rock is 7mL. The correct option is c)7ml
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Answer:
When it comes to ice cream, there are two big advantages to using liquid nitrogen over an electric machine or an old-timey hand-cranked job. First, it’s faster. Second, because it’s faster, there’s less likelihood that your cold confection will develop those pesky ice crystals that form when the ice cream freezes too slowly. To recap: better dessert, in your mouth sooner. What’s not to love?
Make mine the brainliest
Explanation:
b. fission
c. physical
d. chemical
2. Bio Chemistry
3. Organic Chemistry
4. Inorganic Chemistry
Answer:
Organic chemistry
Explanation:
Answer:
This question is incomplete but the completed question is below
What is used up in and stops a chemical reaction? (a) percent yield (b) limiting reactant (c) theoretical yield (d) excess reactant
The correct option is (b)
Explanation:
A chemical reaction is a chemical combination,rearrangement or disintegration of chemical substance(s) (called reactants) to form new chemical substance(s) (called products).
A limiting reactant is the reactant that is totally used up during the course of a reaction. When this reactant is used up, it limits the amount of products formed and eventually stops the chemical reaction.
Hi
The chemical reaction does not stop until the reagent is used .
I hope that's help !
Answer: A solid-state component with three layers of semiconductors is a transistor.
Explanation:
A device with the help of which current or voltage is regulated and for electronic signals it acts as a switch or gate is known as a transistor.
A transistor has three layers of semiconductors. Each of these layers are capable of carrying current.
Thus, we can conclude that a solid-state component with three layers of semiconductors is a transistor.