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3 years ago

18.569 in scientific notation

Chemistry

1 answer:

Reil [10]3 years ago

6 0

answer : 1.8565 × 101

explanation:

To figure out the power of 10, think "how many places do I move the decimal point?"

left arrow When the number is 10 or greater, the decimal point has to move to the left, and the power of 10 is positive.

right arrow

When the number is smaller than 1, the decimal point has to move to the right, so the power of 10 is negative.

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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

Which describes the correct number and types of atoms in this molecular structure?

Andrews [41]

Answer: Option (1) is the correct answer.

Explanation:

The molecular structure is as follows.

$CH_{3}-CO-CH_{2}-CO-CH_{3}$

This compound contains carbon (C) atoms, hydrogen (H) atoms, oxygen (O) atoms.

Or, the chemical formula of this compound is $C_{5}H_{8}O_{2}$ .

Thus, we can conclude that there are five carbon atoms, eight hydrogen atoms and two oxygen atoms.

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3 years ago

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Describe one physical and 1 Chemical way that the salt could be separated from the water

SOVA2 [1]

Answer:

if it dont dissolve

Explanation:

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3 years ago

Which two molecules come out of the chloroplast in photosynthesis?

melisa1 [442]

Answer:

(H2O) and (O2) ??

Explanation:

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Which statement is true for gases, but not for solids or liquids? A. The particles are in motion. B. The particles rarely touch

andriy [413]

Answer:

B. The particles rarely touch each other.

Explanation:

The particles of gases are far apart, so they rarely touch each other. The particles of liquids can slide past each other, and the particles of solids are locked in place next to each other.

In all three states of matter, the particles

Have a definite volume
Are in constant motion
Have kinetic energy

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3 years ago