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Vadim26 [7]
3 years ago
14

List 5-6 facts about earths interior.

Chemistry
1 answer:
Lelechka [254]3 years ago
5 0

Answer:

it has many layers

the inner core is solid

the core is iron

its very hot

the presusre increases as you move closer to the core

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Hydrogen bonds can be found between molecules of which substance?
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I believe the answer is D
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Will mark brainliest!
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The decoders of the DNA messege
4 0
4 years ago
Calculate the molarity of sodium chloride in a half-normal saline solution (0.45% NaCl). The molar mass of NaCl
Cerrena [4.2K]

Answer:

0.077 M

Explanation:

Molarity is the representation of the solution.

Molarity:

It is amount of solute in moles per liter of solution and represented by M

Formula used for Molarity

                    M = moles of solute / Liter of solution . . . . . . . . . . (1)

Data Given :

The concentration of half normal (NaCl) saline = 0.45g / 100 g

So,

Volume of Solution =  100 g = 100 mL

Volume of Solution in L =  100 mL / 1000

Volume of Solution =  0.1 L

molar mass of NaCl = 58.44 g/mol

Now to find number of moles of Nacl

               no. of moles of NaCl = mass of NaCl / molar mass

               no. of moles of NaCl =  0.45g / 58.44 g/mol

               no. of moles of NaCl =  0.0077 g

Put values in the eq (1)

                  M = moles of solute / Liter of solution . . . . . . . . . . (1)

                  M = 0.0077 g / 0.1 L

                  M = 0.077 M

So the molarity of half-normal saline solution (0.45% NaCl) = 0.077 M

3 0
4 years ago
3. The molar volume of a gas at STP occupies<br> 0 1 kilopascal<br> O ooc<br> 12 grams<br> 22.4 L
Reil [10]

The molar volume of a gas at STP occupies <u>22.4 L.</u>

Option D

<u>Explanation:</u>

To find the volume of 1 mole of a gas at STP, we use the Ideal Gas Law. It is the general gas equation which gives the relation to the measurable quantities to an ideal gas as below,

P (pressure) × V (volume) = n (number of moles) × R (the gas constant) × T (temperature in Kelvin)

STP = 1 atm of pressure and 273 K for temperature

P = 1 atm

V = ?

n = 1 mole

R = 0.0821 atm L/mol K

T = 273 K

Using the equation,

\mathrm{PV}=\mathrm{nRT}

V=\frac{n R T}{P}

By substituting the above values, in the equation,

V=\frac{1 \times 0.082 \times 273}{1}=22.38\ L

V = 22.38 L

8 0
3 years ago
How many moles are dissolved in 1.5 L of a 5.7 M solution?
Scrat [10]

Answer:

8.55 moles

Explanation:

The formula for calculating molarity is moles of solute divided by liters of solution. In this case:

5.7=\frac{x}{1.5}

x=5.7\cdot 1.5=8.55 moles. Hope this helps!

4 0
3 years ago
Read 2 more answers
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