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alex41 [277]
2 years ago
12

Which is a type of star system?

Chemistry
1 answer:
Pepsi [2]2 years ago
7 0

<h2><em>hope my answer is useful..</em></h2><h2><em>hope my answer is useful.. </em></h2>

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How many atoms are in 4.90 mol of Al2O3
Finger [1]

Answer:

12 g of 12C to three significant figures maybe?

Explanation:

tell if correct or not im sorry fi it isnt :c

4 0
3 years ago
What activates a convection current, starting the flow of a fluid ??
Grace [21]
Hey there!

<span>What activates a convection current, starting the flow of a fluid ?

Answer: </span>

<span>D. Temperature differences in the mantle </span><span>
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6 0
3 years ago
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Chemistry help! Please zoom in to see better ​
sergeinik [125]

Answer:

82.04g

Explanation:

To solve this problem, you need to find the molar mass of HCl, which is the sum of the molar mass of H plus the molar mass of Cl. The molar mass of H is 1.008g/mol while the molar mass of Cl is 35.45g/mol. Thusly the molar mass of HCl is 36.458g/mol. You have 2.25 moles of HCl, so multiply the number of moles by the molar mass to get the mass in g. In this case it is 2.25mol * 36.458g/mol = 82.04g.

If I helped, a brainliest would be greatly appreciated!

3 0
3 years ago
Why aren’t the same natural resources found all over the world?
Harman [31]

Answer: OK so Natural resources are not evenly distributed all over the world. Some places are more endowed than others — for instance, some regions have lots of water (and access to the ocean and seas). Others have lots of minerals and forestlands. Others have metallic rocks, wildlife, fossil fuels, and so on.The distribution of natural resources depends upon many physical factors like land, climate and altitude. The distribution of resources is unequal because these factors differ from place to place on this earth. Hope this helps have a nice night❤️

Explanation:

7 0
3 years ago
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Calculate the number of joules of heat energy needed to increase the temperature of 25.0 g of metal from 21.0 ºC to 80.0 ºC. The
Harman [31]

Answer:

Q = 768.47 J

Explanation:

Given that,

Mass of the metal, m = 25 g

Initial temperature, T₁ = 21.0 ºC

Final temperature, T₂ = 80.0 ºC

The specific heat of the metal is 0.521 J/gºC.

We know that the heat released due to the change in temperature is given by :

Q=mc\Delta T\\\\=25\times 0.521\times (80-21)\\Q=768.47\ J

Hence, 768.47 J of heat energy will be needed.

7 0
3 years ago
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