3 years ago

What do concentric contour lines on a topographic map represent?

1 answer:

5 0

Answer:

Concentric circles of contour lines indicate a hilltop; concentric circles with hachure marks indicate a close depression.

Explanation:

Hope this helped Mark BRAINLIEST!!!

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What is the volume of 84 g of bromine gas (Br2) at STP?

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Answer : The correct option is, 11.77 L

Solution : Given,

Mass of bromine gas = 84 g

Molar mass of bromine gas = 159.8 g/mole

First we have to calculate the moles of bromine gas.

$\text{Moles of }Br_2=\frac{\text{ given mass of }Br_2}{\text{ molar mass of }Br_2}=\frac{84g}{159.8g/mole}=0.5256moles$

Now we have to calculate the volume of bromine gas at STP.

As we know that at STP,

1 mole of bromine gas contains 22.4 L volume of bromine gas

So, 0.5256 mole of bromine gas contains $22.4\times 0.5256=11.77L$ volume of bromine gas

Therefore, the volume of bromine gas at STP is, 11.77 L

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