PLEASE HELP!! A model of an atom is shown below. Which element is represented by this
model?

Answer:

I hope this helps 52.2 g/mol

Explanation:

1) Solve for the moles using PV = nRT:

n = PV / RT

n = [(700.0 mmHg / 760.0 mmHg atm¯1) (48.0 L)] / [(0.08206 L atm mol¯1 K¯1) (293.0 K)]

n = 1.8388 mol

2) Divide the grams given (96.0) by the moles just calculated above:

96.0 g / 1.8388 mol = 52.2 g/mol

Molecular weight of the gas is 52.2 g/mol.

Ideal gas equation is a hypothetical equation which tells about the behavior of the gas under standard condition and it ca be described as:

PV = nRT, where

P = pressure = 700.0 mm Hg (given)

V = volume = 48.0 L (given)

R = universal gas constant = 0.08206 L atm mol¯¹ K¯¹

T = temperature = 20.0 °C = 293 K

On putting theses values in the above equation we get for moles is as:

n = (700 × 48) / (0.08206 × 293) = 1.8 moles

We know that moles can be represented as:

n = W / M, where

W = given weight = 96g

M = molecular weight = to find?

Putting values in the mole equation, we get

M = 96 / 1.8 = 52.2 g/mol

Hence, molecular weight of gas is 52.2 g/mol.

To know more about ideal gas equation, visit the below link:

https://brainly.com/question/1056445

Answer and Explanation:

Sodium has 11 protons.

To know how many protons are in an element on the periodic table, all you have to do is look at the atomic number. The atomic number is the same as the amount of protons.

The amount of protons defines the element, which is why it appears on the element description as the atomic number.

Hope this helps!

#teamtrees #WAP (Water And Plant)

Answer: Soil permeability is the property of the soil to transmit water and air and is one of the most important qualities to consider for fish culture. A pond built in impermeable soil will lose little water through seepage. The more permeable the soil, the greater the seepage.

Explanation:

Answer:

b

Explanation:

because the correct answer

Answer:

That's Law of Motion because the second law is based on acceleration of an object and its mssd but the boat isn't accelerating.

The third law is based on if the object has an equal and opposite force but there's no opposite force compelling the action

Explanation:

The problem deals with a phase transition from solid to liquid. To the left we have ice and to the right we have liquid water.

For such change to take place, the process of melting must occur. During melting, a solid changes state from solid to liquid by taking energy from the environment.

The pressure is doubled(2 atm)

Given

50 L of CO₂ gas at STP

Required

The pressure

Solution

Changing pressure, constant temperature⇒Boyle's Law

At a fixed temperature, the gas volume is inversely proportional to the pressure applied  

[tex]\tt \rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]

STP⇒1 atm, T=273 K

The (new) volume of gas in half, so V₂=0.5 V₁ = 0.5 x 50 = 25 L

Because the gas volume is inversely proportional to the pressure than the pressure doubled = 2 atm

Or we can use the formula :

P₂=(P₁V₁)/V₂

P₂=(1 atm x 50 L)/25 L

P₂= 2 atm

Answer:

I believe it is B,fluorine to complete the octet rule

Explanation:

Answer:

fluorine to complete the octet rule

Explanation:

Answer:

F. 6

Explanation:

Answer:

Noble gases are odorless, colorless, nonflammable, and monotonic gases that have low chemical reactivity. The full valence electron shells of these atoms make noble gases extremely stable and unlikely to form chemical bonds because they have little tendency to gain or lose electrons.

Answer:

noble gas

Explanation:

noble gas don't react because they already fulfill the octet rule. and have 8 valence electron

Answer:

adding coefficient

Explanation:

To balance a chemical equation we have to place coefficients as needed in front of the symbols or formulas so the same number of each type of atom occurs in both reactants and products

Answer:

S2I3

I can't type it on the key board but it's S and 2 is small down side

I and the 3 is down side too

Answer:

An Element is a substance made up of only one type of atom as like gold, copper, oxygen, etc.

Copper sulphate with molecular formula [tex](CuSO_4)[/tex], the elements are copper, sulphur and oxygen. It is formed by combination of [tex]Cu^{2+}[/tex] cation and [tex]SO_4^{2-}[/tex] anion.

Copper sulphide with molecular formula [tex](CuS)[/tex], the elements are copper and sulphur. It is formed by combination of [tex]Cu^{2+}[/tex] cation and [tex]S^{2-}[/tex] anion.

The specific heat of unknown material : 3.675 J/g °C

Given

mass of block = 22.5 g

Q = heat = 2067 J

Δt=25 °C

Required

The specific heat

Solution

Heat can be formulated :

Q = m.c.Δt

Input the value :

2067 J = 22.5 g x c x 25 °C

c = 3.675 J/g °C

Answer:

1. Cerium

2. Iodine

3. Potassium

4. Lead

5. Boron

6. Calcium

7. Krypton

8. Einsteinium

Explanation:

Hope it helped!

Solids are defined by the following characteristics:

definite shape (rigid)

definite volume.

particles vibrate around fixed axes.

Answer:    Atmosphere - Atmosphere - Troposphere: The lowest portion of the atmosphere is the troposphere, a layer where temperature generally decreases with height. This layer contains most of Earth’s clouds and is the location where weather primarily occurs. The lower levels of the troposphere are usually strongly influenced by Earth’s surface.

Explanation:

Answer:

this is nice..... cool

Explanation:

One way to determine if a rock sample is metamorphic is by "noticing light and dark color bands."

The percentage of mercury in the ore : 2.49%

Given

12 g of sample

2.89% HgS

Required

The percentage

Solution

mass of HgS in the ore :

= 2.89% x 12 g

= 0.3468 g HgS

Mass of Hg in HgS :

= (Ar Hg/MW HgS) x mass HgS

= (200.592/232,66 g/mol) x 0.3468

= 0.299 g

% mercury (Hg) in sample(a crude ore) :

= (0.299 g : 12 g) x 100%

= 2.49%

0.6 g NaCl

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[RxN - Balanced] Na₂CO₃ (aq) + CaCl₂ (aq) → CaCO₃ (s) + 2NaCl (aq)

[Given] 0.5 g Na₂CO₃ reacted with excess CaCl₂

Step 2: Identify Conversions

[RxN] Na₂CO₃ → 2NaCl

Molar Mass of Na - 22.99 g/mol

Molar Mass of C - 12.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of Cl - 35.45 g/mol

Molar Mass of Na₂CO₃ - 2(22.99) + 12.01 + 3(16.00) = 105.99 g/mol

Molar Mass of NaCl - 22.99 + 35.45 = 58.44 g/mol

Step 3: Stoichiometry

Step 4: Check

Follow sig fig rules and round. We are given 1 sig fig.

0.551373 g NaCl ≈ 0.6 g NaCl

Answer:

0.0072mole

Explanation:

Given parameters:

Mass of the compound given  = 0.532g

Unknown:

Number of moles  = ?

Solution:

To solve this problem, we need to use the expression below:

       Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

Molar mass of Ca(OH)₂   = 40 + 2(16 + 1)  = 74g/mol

   Number of moles  = [tex]\frac{0.532}{74}[/tex]   = 0.0072mole

Answer:

B)

Morse code

Explanation:

Morse code is a communication system developed by Samuel Morse, an American inventor, in the late 1830s. The code uses a combination of short and long pulses – dots and dashes, respectively – that correspond to letters of the alphabet.

Answer:

b

Explanation:

I got it right on the exam. Morse code is your answer.

Answer:

0.04 mol Ne

General Formulas and Concepts:

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Gas Laws

Combined Gas Law: PV = nRT

Explanation:

Step 1: Define

P = 200 kPa

V = 0.50 L

T = 50°C

Step 2: Identify Conversions

Temperature Conversion: K = °C + 273.15

Step 3: Convert

Step 4: Find Moles

Step 5: Check

Follow sig fig rules and round. We are given 1 sig figs as our lowest.

0.037221 mol Ne ≈ 0.04 mol Ne

Answer:

it depends on mass and speed

Answer:

1280J are required.

Explanation:

Heat of fusion is defined as the amount of heat required to change its state from liquid to solid at its melting point at constant pressure.

As heat of fusion of gold is 64J/g, there are required 64J to melt 1g of gold at its melting point. The energy required to melt 20g is:

20g * (64J/g) =

1280J are required