What's at the bottom of a black hole?

The element that has maximum density at STP is copper.

Further explanation:

The property is a unique feature of the substance that differentiates it from the other substances. It is classified into two types:

1. Intensive properties:

These are the properties that depend on the nature of the substance. These don't depend on the size of the system. Their values remain unaltered even if the system is further divided into a number of subsystems. Temperature, refractive index, concentration, pressure, and density are some of the examples of intensive properties.

2. Extensive properties:

These are the properties that depend on the amount of the substance. These are additive in nature when a single system is divided into many subsystems. Mass, energy, size, weight, and length are some of the examples of extensive properties.

Density is a characteristic property of the substance. It is defined as the mass per unit volume. It is generally represented by .

The formula to calculate the density of the liquid is,

Standard Temperature and Pressure is denoted as STP and the volume of 1 mole of gas at STP is 22.4 litres.  

The volume is constant and therefore density is directly related to mass.

Among the given elements copper has the highest molar mass and that is . Therefore the element that has maximum density at STP is copper.

Learn more:

1. Calculation of density: brainly.com/question/778841

2. Determine how many moles of water produce: brainly.com/question/1405182

Answer details:

Grade: Middle School

Subject: Chemistry

Chapter: Density

Keywords: density, mass, volume, STP, intensive, extensive, characteristic property, element, copper, chlorine, calcium, and carbon.

Answer:

Explanation:

Pb(NO3)2 (aq) + 2 NaI (aq) --> PbI2 (s) + 2 NaNO3 (aq)

MM for each compound -

Pb(NO3): 207 + 14x2 + 16x3x2 = 331

PI2: 207 + 127x2 = 461

NaI: 23 + 127 = 150

NaNO3: 23 + 14 + 16x3 = 85

Moles of Pb(NO3)2 = 50/331 = 0.15

Moles of NaI = 30/150 = 0.2

Ratio of moles is 1:2

So NaI is limiting

Limited to 0.2/2 = 0.1 mole of Pb(NO3)2

Excess = 0.15 - 0.1 = 0.05 mole

Mass remains = 0.05x331 = 16.55 grams

Moles of NaNO3 formed = Moles of NaI reacted = 0.2

Mass = 0.2x85 = 17 grams

Moles of PbI2 formed = Moles of Pb(NO3)2 reacted = 0.1

Mass = 0.1x461 = 46.1 grams

If 12 grams of NaNO3 actually formed in the reaction,

percent yield = 12/17x100% = 70.6%

Answer:

Explanation:

Moles of Pb(NO3)2 =  mass/molecular mass

= 50.0 grams/(207.20*1 + 14.01*2 + 16*6)

= 50.0 grams/331.22

= 0.15 moles

Moles of NaI

= 30/(22.99+126.9)

= 30/149.89

= 0.2 Moles

A. NaI is less 2x Pb(NO3)2 so NaI is the limiting reagent.

B. The ratio is 1 to 2 so there is 0.15 - 0.2/2 = 0.05 mole

or 16.78 grams of Pb(NO3)2 left.

C. As NaI is limiting, only 0.2 Moles of NaNO3 is formed.

Mass =  Moles * Molecular Mass

Molecular Mass of NaNO3 can be calculated as:  

Na - 22.99

N - 14.01

O - 3(16) = 48

23+14+48 = 85gram / mole

Thus, Mass =  0.2*85  = 17 gram of NaNO3

Mass is conserved in a chemical reaction.

Mass of PbI2 can be calculated as:

50+30-16.78-17

= 46.3 gram of PbI2

Mass =  

12.75

Thus, 12.75g of Sodium Nitrate can be formed

Answer : The moles of magnesium will be, 2.5 moles

Explanation : Given,

Mass of magnesium = 60 g

Molar mass of magnesium = 24 g/mole

Formula used :

Now put all the given values in this formula, we get the moles of magnesium.

Therefore, the moles of magnesium will be, 2.5 moles

Answer:

28 grams

Explanation:

Molar mass of Nitrogen = 14 u

Mass = Mole * Molar Mass

= 2 * 14

= 28 g

There are approximately of silver in the 100 mL silver bar.

To determine the number of atoms in a silver bar, you can follow these steps:

Calculate the mass of the silver bar:

Mass (g) = Volume (mL) x Density (g/mL)

Mass = 100 mL x 10.5 g/mL = 1050 g

Calculate the molar mass of silver (Ag):

The molar mass of silver (Ag) is approximately 107.87 g/mol.

Calculate the number of moles of silver in the bar:

Moles = Mass (g) / Molar Mass (g/mol)

Moles = 1050 g / 107.87 g/mol ≈ 9.73 moles

Calculate Avogadro's number:

Avogadro's number is approximately

Calculate the number of silver atoms in the bar:

Number of atoms = Moles x Avogadro's number

Number of atoms =

Thus, there are approximately of silver in the 100 mL silver bar.

For more such questions on silver:

brainly.com/question/18510431

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