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4 years ago

The density of a mineral is 2.6g/cm* what is the specific gravity

Chemistry

1 answer:

vesna_86 [32]4 years ago

5 0

Answer:

Specific gravity of mineral = 2.6

Explanation:

Given data:

Density of mineral = 2.6 g/cm³

Specific gravity = ?

Solution:

Specific gravity:

Specific gravity of a substance is ration of density of substance and the density of reference substance. It is unit less quantity.

Mostly water is taken as reference substance.

The density of water is 1 g/cm³

Thus the specific gravity of mineral is,

Specific gravity of mineral = density of mineral /density of water

Specific gravity of mineral = 2.6 g/cm³ / 1 g/cm³

Specific gravity of mineral = 2.6

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Maximum heat transfer in heat exchanger happend in :

Elina [12.6K]

Answer:

b) Counter current

Explanation:

In mechanical, chemical, nuclear and other systems, it happens that heat must be transferred from one place to another or from one fluid to another. Heat exchangers are the devices that allow you to perform this task the types of exchangers are presented of heat as a function of flow: parallel flow; counterflow; cross flow.

Among the main reasons why exchangers are used

Heat are as follows:

• Heat a cold fluid using a fluid with a higher temperature.

• Reduce the temperature of a fluid by means of a fluid with a lower temperature.

• Bring the fluid to the boiling point using a fluid with a higher temperature.

• Condense a fluid in a gaseous state by means of a cold fluid

A backflow occurs when the two fluids flow in the same direction but in opposite way. Each of the fluids enters the exchanger through different ends Since the fluid with less temperature goes backflow from the heat exchanger at the end where the fluid enters with higher temperature, the temperature of the coldest fluid will approach the temperature of the inlet fluid.

This type of exchanger turns out to be more efficient than the other two types mentioned above. In contract with the exchanger parallel flow heat, the counterflow exchanger may have the highest temperature in the cold fluid and the lower temperature in the hot fluid after heat transfer in the exchanger.

Be careful with turbulent that it is not a type of exchanger but a system in which a fluid is found.

6 0

3 years ago

1. To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 4.8-L bulb, then fil

Delvig [45]

Answer:

1) The diometic gas is N2 (molar mass 28 g/mol)

2) The partialpressure of oxygen is 316.6 mmHg

Explanation:

Step 1: Data given

Volume = 4.8 L

pressure = 1.60 atm

temperature = 30.0°C

Difference in mass after weighting again = 8.7 grams

Step 2:

PV = nRT

⇒ with P = the pressure of the gas = 1.60 atm

⇒ with V = the volume of the gas = 4.8 L

⇒ with n = the number of moles = mass/molar mass

⇒ with R = the gas constant = 0.08206 L*atm/k*mol

⇒ with T = the temperature = 30.0 °C = 303 K

(1.60 atm) (4.8L) = (n)*(0.08206)*(303 K)

n = (1.60 * 4.8) / ( 0.08206*303)

n = 0.30888 mol

Step 3: Calculate molar mass

Molar mass = mass / moles

Molar mass = 8.7 grams / 0.3089 moles

Molar mass ≈ 28 g/mol

The diometic gas is N2

2) What is the partial pressure of oxygen in the mixture if the total pressure is 545mmHg ?

Step 1: Calculate mass of nitrogen

Let's assume a 100 gram sample. This means 38.8 grams is nitrogen

Step2: Calculate moles of N2

Moles N2 = mass N2 / molar mass N2

Moles N2 = 38.8 grams / 28 .02 grams

Moles N2 = 1.38 moles

Step 3: Calculate moles of O2

Moles O2 = (100 - 38.8)/ 32 g/mol

Moles O2 = 1.9125 moles O2

Step 4: Calculate molefraction of oxygen

Molefraction O2 = moles of component/total moles in mixture

=1.9125/(1.9125 + 1.38 moles)

=0.581

Step 5: Calculate the partial pressure of oxygen

PO2 =molefraction O2 * Ptotal

=0.581 * 545mmHg

=316.6 mmHg

The partialpressure of oxygen is 316.6 mmHg

7 0

3 years ago

A mixture in which the particles are medium-sized between 1nm and 1000 nm in diameter is called a _______.

____ [38]

The answer is Colloid

3 0

3 years ago

Which provides evidence to support the big bang theory?

Stolb23 [73]

A. 
the change in carbon dioxide levels in the atmosphere

hope that's right and hope i helped

6 0

3 years ago

11. Selecting specific traits to create a new breed of an animal would be an

Lynna [10]

Selective breeding

The Alleles

DNA

X and Y chromosome from mother and father

Nucleus

Gene

Explanation:

In selective breeding, a specific trait of the animal is considered and the gene coding for that trait is used to create new breeds. Example - cow producing lot of milk.

Genotypes are always expressed by the alleles.
Example - Genotype of Tall plants would be TT or Tt

Information is passed from parents to offsprings from the information stored in DNA.
A gender of an individual is determined by the x chromosomes of mother and X and Y chromosome of father.
X chromosome from mother and X chromosome from father would form a female and X chromosome from mother and Y chromosome from father would form a male.
DNA is located inside the nucleus of the cell
Gene is the segment of chromosome that codes for a specific protein. The non coding segment of chromososme is heterochromatin.

7 0

3 years ago