How many moles are in 4.30 grams of lead (Pb) ?

Answer:

13500 N

Explanation:

According to newtons second law of motion

mass m =1500 Kg

a = 9m/s^2

Force F = mass m × acceleration a

F = 1500×9= 13500 N

It is right? or is it ice and acid at the samee timeee?

Answer:

4.50 L

Explanation:

First we calculate how many moles are there in 3.84 L of a 8.50 mol/L solution:

Now, keeping in mind that

we can calculate the volume of a 7.25 mol/L solution that would contain 32.64 moles:

So we could take 4.50 L of the 7.25 mol/L solution and evaporate the solvent until only 3.84 L remain.

Answer:

B.

Explanation:

Weather changes daily and varies in different areas around the world

Answer:

i dont know how exactly you want this but ill give it a go

the sun is a star, the diagram is a diagram of a galaxy, and the outside of the rings contains everything else???

Explanation:

im sorry i tried i really dont know.

Answer:

2Mg + O2 -> 2MgO

Explanation:

According to the above reaction ,

28.6g(2mole) Mg combine with 32g (1mole) of O2 to give 80.6g (2 mole) of MgO.

thus,

30g Mg will combine with 20g of O2 to produce 50g MgO and 10gO2 will remain unreactive.

I hope it's helpful!

Answer:

Hi I ll explain

Explanation:

[tex]0.4mol \times \frac{22.4liter}{1mol} = 8.96liter[/tex]

Remember

At STP always one mole of every gas equals 22.4 liter

Answer:

Ice is less dense than water.

Answer:

10 electrons.

Explanation:

Hello!

In this case, since a normal atom of magnesium has 12 protons and electrons when is not in the form of a cation, since it is a metal that tends to lose electrons when ionized, and therefore it becomes positively charged, we infer  that in form of:

[tex]Mg^{2+}[/tex]

It only has 10 electrons.

Best regards!

Given :

A student titrates 0.2087 g of an unknown diprotic acid with 0.1224 M sodium hydroxide.

It takes 32.47 mL of the NaOH solution to reach the endpoint.

To Find :

How many moles of NaOH are used in the titration.

Solution :

Number of moles( n ) is given by :

n = Molarity × Volume( in liters )

n = [tex]0.1224 \times \dfrac{32.47}{1000}\ moles[/tex]

n = 0.00397 moles.

Therefore, moles of NaOH are used in the titration is [tex]3.97\times 10^{-3} \ moles[/tex].

The number of moles  of NaOH are used in the titration is [tex]3.97 \times 10^{-3}[/tex] moles.

The number of moles should be

[tex]= molarity \times volume\\\\= 0.1224 \times \frac{32.47}{1000}[/tex]

= 0.00397 moles.

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Answer:

Mass = 51 g

Explanation:

Given data:

Mass of nitrogen = 41.93 g

Mass of ammonia formed = ?

Solution:

Chemical equation:

N₂ + 3H₂      →       2NH₃

Number of moles of nitrogen:

Number of moles = mass/molar mass

Number of moles = 41.93 g/ 28 g/mol

Number of moles = 1.5 mol

now we will compare the moles of nitrogen and ammonia.

                N₂          :           NH₃

                  1          :           2

                1.5         :         2/1×1.5 = 3 mol

Mass of ammonia formed:

Mass = number of moles × molar mass

Mass = 3 mol × 17 g/mol

Mass = 51 g

Explanation:

The partial pressure of an individual gas is equal to the total pressure of the mixture multiplied by the mole fraction of the gas.

Total pressure = 2atm

Mole Fraction = number of moles / total number of moles

Neon

Mole Fraction = 4.46 / 7.35 = 0.607

Partial Pressure = 0.607 * 2 = 1.214 atm

Argon

Mole Fraction = 0.74 / 7.35 = 0.101

Partial Pressure = 0.101 * 2 = 0.202 atm

Xenon

Mole Fraction = 2.15 / 7.35 = 0.293

Partial Pressure = 0.293 * 2 = 0.586 atm

Answer:

CH4

Explanation:

It is a symmetrical molecule thus making it a non-polar molecule

Answer:

Confection  

Explanation:

Answer:

2 -  Radiation

Explanation:

The air above the stove is heated and because it is gas, moves upward. This is convection. The bottom of the pot and the surface of the stove are not 100% flat. In those areas where the stove and the bottom of the pot are not in contact, radiation transports heat from the stove to the heat. Which heats up the kernals.

The volume of Mercury spilled : 0.613 milliliters

Given

8.3 g of Mercury

Required

The volume

Solution

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

Density formula:  

[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]

ρ = density  

m = mass  

v = volume  

Density of mercury : 13.534 g/cm³

Input the value :

V = m : ρ

V = 8.3 g : 13.534 g/cm³

V = 0.613 cm³= 0.613 ml

Answer:

Glucose

Explanation:

This question is taken from a story that's on the internet titled "diagnosing Elisa".

Now, the diagnosis of Elisa found out that Elisa felt tired because her cells were not getting the daily amount of molecules they required from food and air and this made her cells not to function, grow & repair efficiently. In addition, the diagnoses further explained lack of molecules to mean that although that Elisa's cells were getting sufficient oxygen and amino acids molecules, but did not get sufficient glucose molecules.

Answer:23.9 g

Explanation:

Grams C = (12/6.02214076)*12 = 23.9 g

There are 23.9 grams of carbon are in [tex]12*10^{23}[/tex] atoms of carbon.

As we know that, atomic mass of carbon is 12.

It means that, In one mole of carbon , 12 grams of carbon is present.

    1 mole [tex]=6.022*10^{23} atoms[/tex]

In [tex]6.022*10^{23}[/tex] atoms of carbon, 12 grams of carbon is present.

So,  In [tex]12*10^{23}[/tex] atoms of carbon,

                                 [tex]=\frac{12}{6.022*10^{23} }*6*10^{23}\\\\=23.9 grams[/tex]

There are 23.9 grams of carbon are in [tex]12*10^{23}[/tex] atoms of carbon.

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Answer:

The new reading of the water level is 54.81 mL.

Explanation:

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

Mass of object = 26.7 g

Density of object = 0.767 g/mL

Volume of water = 20 mL

New reading of the water level =?

Next, we shall determine the volume of the object. This can be obtained as follow:

Mass of object = 26.7 g

Density of object = 0.767 g/mL

Volume of object =?

Density = mass /volume

0.767 = 26.7 / volume of object

Cross multiply

0.767 × Volume of object = 26.7

Divide both side by 0.767

Volume of object = 26.7 / 0.767

Volume of object = 34.81 mL

Finally, we shall determine the new reading of the water level. This can be obtained as follow:

Volume of water = 20 mL

Volume of object = 34.81 mL

New reading of the water level =?

New reading of the water level = (Volume of water) + (Volume of object)

New reading = 20 + 34.81

New reading of the water level = 54.81 mL

Answer:

7

Explanation:

not including the comas but if you add 4+3 it equals 7.

Answer:

7 significant figures

Explanation:

Answer:

b

Explanation:

Answer:

3.02× 10²⁴ atoms

Explanation:

Given data:

Number of nitrogen atoms = ?

Number of moles of N₂O = 2.51 mol

Solution:

1 mole contain 2 mole of nitrogen atoms.

2.51 × 2 = 5.02  mol

According to Avogadro number,

1 mole = 6.022 × 10²³ atoms

5.02  mol ×  6.022 × 10²³ atoms / 1 mol

30.2 × 10²³ atoms

3.02× 10²⁴ atoms

Answer:

0.53

Explanation:

A solution is made by mixing 42 g of chloroform (CHCl₃) and 31 g of heptane (C₇H₁₆). Calculate the mole fraction of chloroform in this solution. Be sure your answer has the correct number of significant digits.

Step 1: Calculate the number of moles of chloroform

The molar mass of CHCl₃ is 119.38 g/mol.

42 g × 1 mol/119.38 g = 0.35 mol

Step 2: Calculate the number of moles of heptane

The molar mass of C₇H₁₆ is 100.20 g/mol.

31 g × 1 mol/100.20 g = 0.31 mol

Step 3: Calculate the total number of moles

We will use the following expression.

n = nCHCl₃ + nC₇H₁₆ = 0.35 mol + 0.31 mol = 0.66 mol

Step 4: Calculate the mole fraction of chloroform

We will use the following expression.

χ(CHCl₃) = nCHCl₃ / n

χ(CHCl₃) = 0.35 mol / 0.66 mol = 0.53

Answer:

the amount of atoms and particle I think is in here is 17 that oxygen and water can hold with the amount of barium hydrogen.

Answer:

Pb

Explanation:

Answer:

Pb is the answer You're looking for

Answer:

no it will take more time to boil

Answer:

6H2 + P4→ 4PH3

Explanation:

Phosphorus has 4 in it and hydrogen has 3 in it. in order to balance it, we have to put 4 in front of phosphine so that the phosphorus on the product side has an equal amount as to the one on the reactant side.

the only one left to balance is hydrogen and so in order to balance it we put a 6 on h2 because the hydrogen in the product size becomes 12 (4 * 3).

therefore the hydrogen on the reactant side becomes 12 as well (6 * 2)

The balanced chemical reaction is:

                      [tex]6H_2(g)+P_4(s)\rightarrow 4PH_3(g)[/tex]

Explanation:

                       [tex]H_2(g)+P_4(s)\rightarrow PH_3(g)[/tex]

Balancing the chemical reaction:

                         [tex]H_2(g)+P_4(s)\rightarrow 4PH_3(g)[/tex]

                        [tex]6H_2(g)+P_4(s)\rightarrow 4PH_3(g)[/tex]

So, the balanced chemical reaction is:

                        [tex]6H_2(g)+P_4(s)\rightarrow 4PH_3(g)[/tex]

Learn more about the balanced chemical reaction here:

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Answer:

904.014 j/kgk

Explanation:

Mass of metal = 45g

Temperature of metal = 85.6°

Mass of water = 150

Temperature of water = 24.6

Final temperature of system = 28.3

Heat lost by metal = Heat gained by water

m1 * c1 * dt = m2 * c2 * dt

Q = quantity of heat

Q = m*c*dt

dt = change in temperature

dt of water = 28.3 - 24.6 = 3.7

dt of metal = 85.6 - 28.3 = 57.3

Specific heat capacity of water, c = 4200

(45 * 10^-3) * c * 57.3 = (150 * 10^-3) * 4200 * 3.7

2.5785c1 = 2331

c1 = 2331 / 2.5785

= 904.01396

= 904.014 j/kgk

Answer: its Important that the new cells have a copy of every chromosome so the process involves copying the chromosomes first and then carefully separating the copies to give each new cell a full set

Explanation:ye

Answer: In mitosis a cell divides to form two identical cells. It is important that the  cells have a copy of every chromosome, so the process involves copying the chromosomes first and then carefully separating the copies to give each new cell a full set.