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maw [93]
3 years ago
15

Pls help me will give brainliest.

Chemistry
2 answers:
Artyom0805 [142]3 years ago
7 0

Answer:

C. Earth's Mantle

Explanation:

AlexFokin [52]3 years ago
7 0

Answer:

C

Explanation:

Earth's mantle is the correct answer

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A 14.3 g sample of HF is dissolved into 250 mL of solution. The concentration of the solution is *
STALIN [3.7K]

Answer:

The concentration of the solution is 2.86 M

Explanation:

Molarity is a unit of concentration based on the volume of a solution. It is defined as the number of moles of solute that are dissolved in a given volume. In other words, molarity is defined as the number of moles of solute per liter of solution.

The Molarity of a solution is determined by the following expression:

Molarity (M)=\frac{number of moles of solute}{Volume}

Molarity is expressed in units (\frac{moles}{liter}).

In this case, you must then know the number of moles of HF, for which you must know the molar mass. Being:

  • H: 1 g/mole
  • F: 19 g/mole

the molar mass of HF is: HF= 1 g/mole + 19 g/mole= 20 g/mole

Then the following rule of three applies: if 20 g of HF are available in 1 mole, 14.3 g in how many moles will they be?

moles=\frac{14.3 g*1 mole}{20 g}

moles= 0.715

So:

  • number of moles of solute: 0.715 moles
  • Volume: 250 mL=0.250 L (being 1 L=1000 mL)

Replacing:

Molarity=\frac{0.715 moles}{0.250 L}

Solving:

Molarity= 2.86 \frac{moler}{liter}=2.86 M

<u><em>The concentration of the solution is 2.86 M</em></u>

6 0
3 years ago
What is an example of a change of state. Help I need this answered asappp pls &amp; tyyy
melamori03 [73]

pretty sure its A

water being boiled in a pot shows a phase change from liquid water to gaseous water when it evaporates

all other choices are just changing its form or shape basically, solid to solid

6 0
3 years ago
Calculate how much 95% ethyl alcohol will be required to dissolve 0.1 g of sulfanilamide at 78 c using volume calculate how much
Oduvanchick [21]
According to the source below, the solubility of sulfanilamide in 95% ethyl alcohol at 78°C is 210 mg/mL. Since 0.1 g = 100 mg, we can set up a proportion: 

(210 mg) / (1 mL) = (100 mg) / (x mL) Solving, x = 0.48 mL of 95% ethyl alcohol will be required.


I do not know previously the solubility of sulfanilamide in 95% ethyl alcohol. Let us accept the solubility you quoted here. 

100/210 = 0.47619047619.. ≈ 0.48 (ml) 

at 0C, the amount of sulfanilamide remains in the solution is: 14*(100/210) = 6.67 (mg), since you only have 0.48 ml solution. 

The volume of the solution will change a little by cooling from 78C to 0C. You may also consider this volume change if you have data.
6 0
3 years ago
What are the missing coefficients for the chemical equation <br> [ ] Ca + [ ] O2 → [ ] CaO
katen-ka-za [31]

Answer:

{ \sf{[ 2] Ca_{(s)} + [1 ] O_{2(g)} → [ 2] CaO _{(s)}}}

4 0
3 years ago
What are six forms of energy? Find an example of each.
Evgesh-ka [11]
1-Electric Energy
Example: A lightbulb is an example of electric energy
2-Sound Energy
Example: When a dog barks, that is sound energy
3-Solar Energy
Example: When we use the sun for energy. Like using it to dry our clothes.
4-Chemical Energy
Example: An example is a battery. That may not seem like it, but it is Chemical Energy.
5-Nuclear Energy
Example: A fission reaction at a nuclear powerplant
6-Thermal Energy
Example: A pot of water boiling on an Electric Stove
~Silver
4 0
3 years ago
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