Please someone help me with this!!

Answer:

Less in the top

your well wisher

Answer:

Magnetic field

Explanation:

Answer:

Helium

Explanation:

Answer:

the element is helium as it's mass number is 4 and number of electrons is equal to it's atomic no. which is 2

oops...  sorry...  I need to delete this response.  I was trying to answer a different question,

Answer:

0.0010 w/v %

Explanation:

Based on the reaction:

NiCl₂(aq) + 2AgNO₃(aq) → 2AgCl(s) + Ni(NO₃)₂(aq)

Finding the moles of AgCl produced we can find the moles of NiCl in the reaction medium and its mass:

Moles AgCl -Molar mass: 143.32g/mol-:

5.8mg = 5.8x10⁻³g * (1mol / 143.32g) = 4.047x10⁻⁵ moles AgCl

Moles NiCl₂:

4.047x10⁻⁵ moles AgCl * (1mol NiCl₂ / 2mol AgCl) = 2.023x10⁻⁵ moles NiCl₂

Mass NiCl₂ -Molar mass: 129.60g/mol-:

2.023x10⁻⁵ moles NiCl₂ * (129.60g / mol) = 2.62x10⁻³g of NiCl₂ are produced.

And the concentration in w/v% is:

2.62x10⁻³g NiCl₂ / 250mL * 100 =

Answer:

4.4 mol.

Explanation:

Hello!

In this case, since the formula for calculating the molarity is:

[tex]M=n/V[/tex]

Whereas n stands for moles and V for the volume in liters; we can solve for n as shown below when we are given the volume and the molarity:

[tex]n=V*M[/tex]

Thus, we plug in the given data to obtain:

[tex]n=2.5L*1.75mol/L=4.4mol[/tex]

Best regards!

Answer:

4.4 mol.

Explanation:

Have a great day

Answer:

[tex]m_{Ag}=135.8gAg[/tex]

[tex]Y=88.4\%[/tex]

Explanation:

Hello there!

In this case, according to the described chemical reaction, it is possible to compute the theoretical mass of silver as mass via the 1:2 mole ratio of copper to silver and their atomic mass in the periodic table, in order to perform the following stoichiometric setup:

[tex]m_{Ag}=40.gCu*\frac{1molCu}{63.55gCu}*\frac{2molAg}{1molCu}*\frac{107.87gAg}{1molAg}\\\\ m_{Ag}=135.8gAg[/tex]

Next, given the actual yield of 120 g, we compute the percent yield via:

[tex]Y=\frac{120g}{135.8g}*100\%\\\\Y=88.4\%[/tex]

Regards!

Answer:

7.40×10²² molecules.

Explanation:

From the question given above, the following data were obtained:

Volume of oxygen = 2.75 L

Number of molecules of oxygen =?

Next, we shall determine the number of mole of oxygen present. This can be obtained as follow:

22.4 L contains 1 mole of oxygen at STP.

Therefore, 2.75 L will contain = 2.75 / 22.4 = 0.123 mole of oxygen at STP.

Finally, we shall determine the number of molecules of oxygen present. This can be obtained as follow:

From Avogadro's hypothesis:

1 mole of oxygen = 6.02×10²³ molecules

Therefore,

0.123 mole of oxygen = 0.123 × 6.02×10²³

0.123 mole of oxygen = 7.40×10²² molecules.

Thus, the cylinder contains 7.40×10²² molecules of oxygen.

Answer:

1: f 2: b 3: d 4: e 5:a 6:c

Explanation:

Answer:

Equilibrium constant, Kc = 0.023

Explanation:

Equation for the decomposition of Hydrogen iodide is given below:

2HI ----> H₂ + I₂

Initially, the number of moles of the reactant and the products are given as follows:

n(HI) = 2 * 3.800 moles = 7.600 moles

nH₂) = 0.000 moles

n(I₂) = 0.000 moles

At equilibrium, the equation becomes: 2HI <----> H₂ + I₂

Number of moles of the reactant and the products are given as follows:

n(HI) = 7.600 - (0.886 + 0.886) moles = 5.828 moles

nH₂) = 2 * 0.443 = 0.886 moles

n(I₂) = 2 * 0.443 = 0.886 moles

Equilibrium constant, Kc = [H₂] [I₂] / [HI]²

Equilibrium constant, Kc = (0.886) * (0.886) / (5.828)²

Equilibrium constant, Kc = 0.023

Answer:

1 and the element is hydrogen (there is an exception for the octet rule for the element hydrogen) hope this helps

Explanation:

Answer:

Absolute zero, technically known as zero kelvins, equals −273.15 degrees Celsius, or -459.67 Fahrenheit, and marks the spot on the thermometer where a system reaches its lowest possible energy, or thermal motion. There's a catch, though: absolute zero is impossible to reach.

Explanation:

Answer:

0.02392 m

Explanation:

Kilo - Hecto - Deka - Meters/Liters/Grams - Deci - Centi - Milli

23.92 mm ---> 0.02392 m

Basically move the decimal 3 units to the left.

Hope this helps and stay safe, happy, and healthy, thank you :) !!

Answer:

zoo wee mama

Explanation:

The particles that make up an object are held together by bonds. Insulators have strong bonds that hold their particles rigidly in place. This prevents particles from gaining energy and increasing the temperature. Wool, dry air, plastics, and polystyrene foam are all examples of good insulators.

Answer:

83.7% oxygen, 16.3% hydrogen

Explanation:

Mass of compound = 16.75 g

Mass of Oxygen = 14.02 g

Mass of Hydrogen =  2.73 g

Percentage composition = Mass of element /  Mass of compound    100%

Percentage composition of Oxygen = 14.02 g / 16.75 g    * 100%

Percentage composition of Oxygen = 0.837 * 100 = 83.7%

Percentage composition of Hydrogen = 2.73 g / 16.75 g    * 100%

Percentage composition of Hydrogen = 0.163 * 100 = 16.3%

The correct option is;

83.7% oxygen, 16.3% hydrogen

Answer:

83.7% oxygen, 16.3% hydrogen

Explanation:

To determine the percent composition we can divide, our mass by total mass and afterwards, multiply by 100.

(Mass of O / Total mass) . 100 = % O

(Mass of H / Total mass) . 100 = % H

Remember that:

% O + % H = 100

Mass of O / Total mass + Mass of H / Total mass = 1

(14.02 g / 16.75g) . 100 = 83.7 %

(2.73 g /16.75g) . 100 = 16.3 %

Answer:

They are symbols of elements.

Ra is the symbol of the element Radium

Ah is the symbol of the element Arrhenium

Ma  is the symbol of the element Molybdenum

Ga  is the symbol of the element Gallium

La  is the symbol of the element Lanthanum

Answer:

Ra is the symbol of the element Radium

Ah is the symbol of the element Arrhenium

Ma  is the symbol of the element Molybdenum

Ga  is the symbol of the element Gallium

La  is the symbol of the element Lanthanum

Explanation:

They are elements

Answer:

A 70%

B 92%

C 87%

D 79%

Explanation:

This excercise is about dividing water by liquid.

Answer:

a

Explanation:

Answer:

2.562

Explanation:

First we convert 127 g of H₂CO₃ to moles, using its molar mass:

Then we convert 800 mL to L:

Finally we can calculate the concentration of the solution as molarity:

Answer:

Temperature can change the solubility of a solute.

Explanation:

Answer:

Temperature can change the solubility of a solute.

Explanation:

Answer:

The law companies that value excessive ethics comply with the legal guidelines not solely in letter however go past what is stipulated 1 My proudest accomplishment is organizing a donation pressure aimed at helping the less fortunate humans skills

Explanation:

My bedroom is very clean and big closest it color

Answer:

it should be C. the filtering of ground water. have a good day!

Answer:

K^2O

Explanation:

I remember a question like this one and I got it right its K^2O

(aka its C)

Answer:

Georgia and minessota

Explanation:

they have no production

Answer:

See explanation

Explanation:

A Lewis structure is a representation of atoms of elements using dots. These dots show the number of outermost electrons in the atom. These outermost electrons are involved during ionic bonding.

We can see from the image attached that in ionic bonding, electrons are transferred from the metal to the non metal to form the ionic compound. Arrows have been used to show the transfer of electrons from metals to non metals.

Answer:

. A sample of hydrogen has a volume of 65.0 mL at a pressure of 0.992 atm and a temperature of 16°c. What volume will the hydrogen occupy at 0.984 atm and 25°c? 2. A sample of nitrogen collected in the laboratory occupies a volume of 725 mL at a pressure of 0.971 atm. What volume will the gas occupy at a pressure of 1.40 atm, assuming the ...

Explanation: