Identify the two main materials that can be found in the inner and outer core layers of the earth.

What is the concentration of FeCl3 in a solution prepared by dissolving 10.0 g of FeCl3 in enough water to make 275 mL of soluti

puteri [66]

Answer: The concentartion of solution will be 0.224 M

Explanation:

Molarity : It is defined as the number of moles of solute present per liter of the solution.

Formula used :

$Molarity=\frac{n\times 1000}{V_s}$

where,

n= moles of solute = $\frac{\text{Given mass}}{\text{Molar mass}}=\frac{10.0g}{162.2g/mol}=0.0616moles$

${V_s}$ = volume of solution in ml = 275 ml

Now put all the given values in the formula of molarity, we get

$Molarity=\frac{0.0616\times 1000}{275ml}=0.224mole/L$

Therefore, the concentration of solution will be 0.224 M

7 0

3 years ago

In the electrolysis of water, how long will it take to produce 75.00 L of H2 at 1.0 atm and 273 K using an electrolytic cell thr

IrinaK [193]

answer is 2546 h

mark me as Branliest

7 0

3 years ago

Part A Add single electrons and/or electron pairs as needed to complete the electron-dot symbol for astatine, At. To return the

mezya [45]

Answer:

7 valence electrons

Explanation:

Astatine has the atomic number 85. Thus, its electron configuration is:

[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵

As we can see, in the last level (6) it has 2 + 5 = 7 electrons, that is, astatine has 7 electrons in its valence shell. In the Lewis dot structure (attached) we write 3 pairs of electrons and 1 unpaired electron around the symbol of At.

7 0

3 years ago

A chemist measures the amount of oxygen gas produced during an experiment. She finds that 276. g of oxygen gas is produced. Calc

Nuetrik [128]

<h2>Answer:</h2>

0.152 moles

<h3>Given that: </h3>

The mass of the oxygen gas produced = 4.87 g

Also, The molar mass of oxygen gas, = = 32 g/mol

The formula for the calculation of moles is shown below:

moles = $\frac{Mass-taken}{Molar-mass}$ <u>*</u>

Thus,

moles = $\frac{4.87g}{32g/mol }$

Both given values and the answer is in 3 significant digits.

brainlist pls?

*i put a dash between mass and taken as formulas do no spaces

6 0

3 years ago

2. When Thomson held a positively charged plate near the cathode ray, the beam bent toward the plate. What conclusion can be dra

loris [4]

Answer:

option B is correct : The beam was positively charged.

Explanation:

In 19th century J.J Thomson conducted an experiment on cathode ray tube. These cathode ray tubes were sealed glass tubes inside which the pressure of the gas reduced by evacuating air. Then he applied a high voltage across two electrodes at end of the tube, that voltage caused a beam of particles to flow from the cathode to the anode.

Beam of the particles were originated at the cathode and detected on anode by a phosphorous beyond the anode. As at that time phosphorous sparks and emit light.

To test properties of particles he places two opposite charged electric plates around the cathode rays that is one negative and one positive plate.

Thomson observed that these rays deflected to positive electric plate so it indicated that these rays are composed of negatively charged particles as it was attracted by the positive charged electric plate. These particles later named as electrons.

So,

option B is correct : The beam was positively charged.

8 0

3 years ago