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3 years ago

7

Why does a tree cast a shadow during the daytime? A. The tree is a source of light for the Earth. B. The tree creates sunlight.

C. The tree blocks light from the Sun. D The tree pulls the light off of the ground.

1 answer:

Minchanka [31]3 years ago

8 0

The answer is C because uh. It makes sense

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A solution is prepared by dissolving 318.6 g sucrose (C12H22O11) in 4905 g of water. Determine the molarity of the solution

alexandr1967 [171]

The molarity of sucrose solution is 0.19 M.

The molarity of HCl is 12.8 M.

<u>Explanation:</u>

a. Molarity can be found by finding its moles and volume of water in L and then dividing both(moles divided by volume in Litres).

Mass of sucrose = 318. 6 g

Molar mass of sucrose = 342.3 g/mol

Moles = $$\frac{mass}{molar mass}$

= $$\frac{318.6 g}{342.3 g/mol}$

= 0.93 moles

Mass of water = 4905 g

Density of water = 1000 g/L

Volume = $$\frac{mass}{density}$

= $$\frac{4905 g }{1000 g/L}$

= 4.905 L

Now we can find the molarity = $$\frac{moles}{Volume(L)}$

= $$\frac{0.93 moles}{4.905 L}$

= 0.19 M

So the molarity of sucrose solution is 0.19 M.

b. The molarity of HCl can be found as follows.

It is given that 39% HCl that means it contains 39 g of acid in 100 g of water.

Density of the solution is 1.20 g/mL, from this mass can be found as,

$$\frac{1 L \times 1000 mL \times 1.20 g}{1 L \times 1 mL}$

= 1200 g

Now we have to find out the amount of HCl in grams as,

$$\frac{1200g \times 39 g HCl }{100 g solution}$

= 468 g HCl

Now we have to find the number of moles,

moles = $$\frac{468 g}{36.46 g/mol}$

= 12.8 moles

Molarity of HCl = $$\frac{12.8 moles}{1 L }$

= 12.8 M

So the molarity of HCl is 12.8 M.

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3 years ago

I’m which of the following kingdoms are prokaryotes found?i need help ASAP please help

alexgriva [62]

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4 years ago

The elements most likely to form more than type of ion are the....

emmainna [20.7K]

The elements most likely to form more than one type of ion are thetransition metals

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3 years ago

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The density of a liquid can be found by using what tool?

Sloan [31]

Density=mass/volume so once you find the mass and volume of a substance you can then calculate the density

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4 years ago

Consider again the thermite reaction. If 0.0257 g Al react completely, what mass of Fe forms? Use the periodic table to find mol

maxonik [38]

The mass of Fe that is formed is 0.0532 grams

<u><em> Explanation</em></u>

Fe2O3 + 2 Al → Al2O3 + 2 Fe

Step 1: find the moles of Al

moles = mass/molar mass

from periodic table the molar mass of Al= 27 g/mol

moles = 0.0257g /27 g/mol =9.5 x10^-4 moles of Al

Step 2: <em> use the mole ratio to determine the moles of Fe</em>

the moles ratio of Al:Fe is 2:2= 1:1

therefore the moles of Fe is also = 9.5 x10 ^-4 moles

Step 3: <em> find the mass of Fe</em>

mass= moles x molar mass of Fe

from periodic table the molar mass of Fe= 56 g/mol

mass= 9.5 x10 ^-4 moles x 56 g/mol =0.0532 grams

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3 years ago

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