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tatuchka [14]
3 years ago
15

3.90x 10^22 He atoms express your answer using three significant figures

Chemistry
1 answer:
trasher [3.6K]3 years ago
3 0

Answer:

you have a scientific calculator us <u>it</u><em> </em><em>it's</em><em> </em><em>simple</em><em> </em>

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2H2 + O2 → 2H2O
pantera1 [17]
Okay
Mr (H2O)= 18g
therefore moles of H2O
is 720.8/18= 40.04mol
the ratio of H2 to O2 to H2O is
2 : 1 : 2
so moles of H2 is same as H2O here
H2= 40.04moles

moles of O2 is half
so 40.04 x 0.5
20.02moles

grams of O2 is
its moles into Mr of O2
that's 20.02 x 32 = 640.64g

6 0
3 years ago
Is corrosion of aluminum metal a chemical or physical process
nadya68 [22]
Corrosion of aluminium metal is a chemical process. Corrosion happens when a certain chemical reaction takes place.
8 0
3 years ago
Which of the following will increase the strength of a copper electromagnet
Soloha48 [4]

The following will increase the strength of a copper electromagnet;

Adding more loops to the wire

Increasing the current

Explanation:

An electromagnet, a device that transforms electric energy into magnetic energy,  has its magnetic field induced by an electric current. This current must be AC (alternating current) and not Direct Current (D.C) for it to work. Increasing the number of coils in the electromagnet increases the number of field lines of interaction between the current and the paramagnetic material.  Increasing the current also makes the magnetic stronger.

Learn More:

For more on electromagnets check out;

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4 0
3 years ago
Read 2 more answers
What will happen to temperature as you move from Jamestown to massena ?
lorasvet [3.4K]

Answer:

it will increase:)

Explanation:

Hoped this helped you:))

5 0
3 years ago
PLS help, 20 points for you<br><br> I need a Molecular, and Ionic equations:<br> H2CO3 + LiOH -
STatiana [176]

The molecular equation of H₂CO₃ and LiOH:

H₂CO₃ (aq) + 2LiOH (aq) →  Li₂CO₃ (aq)  + 2H₂O (l)

The net ionic equation of the reaction of H₂CO₃ and LiOH:

H⁺ (aq)  + OH⁻ (aq)  →  H₂O (l)

<h3>What are the net ionic equations?</h3>

The net ionic equation of a chemical reaction can be described as an equation that expresses only those ions, elements, or compounds, that directly contributed to that chemical reaction.

The chemical equation for the reaction of H₂CO₃ and LiOH:

H₂CO₃ (aq) + LiOH (aq) →  Li₂CO₃ (aq)  + 2H₂O (l)

The complete ionic equation for the above reaction H₂CO₃ and LiOH is:

2H⁺ (aq) +  CO₃²⁻ (aq) + 2Li⁺ (aq) + 2OH⁻  → 2Li⁺ (aq) + CO₃²⁻(aq) + 2H₂O (l)

In the ionic equation, the Lithium and carbonate ions appear unchanged on both sides of the equation. When we mix the two solutions, neither the Lithium nor carbonate ions participate in the reaction. So Lithium and carbonate ions can be eliminated from the ionic equation.

H⁺ (aq)  + OH⁻ (aq)  →  H₂O (l)

Learn more about the net ionic equation, here:

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6 0
1 year ago
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