What has fewer organisms then a domain but it also has more organisms then a phylum

The mass of a mole of carbon atoms is 12.011 grams. What is the mass of a single atom of carbon?

mixer [17]

Amount of substance can be measured in the number of moles.
Avagadros constant states that 1 mol of any substance is made of 6.022 x 10^23 units.
These units could be atoms making up elements or molecules making up compounds
1 mol of C is made of 6.022 x 10^23 atoms of C
Since 1 mol of C has a mass of 12.011 g
Therefore 6.022 x 10^23 atoms of C weigh 12.011 g
Then 1 atom of C weighs -12.011 g / 6.022 x 10^23 atoms = 1.99 x 10^(-23) g
Mass of 1 C atom is 1.99 x 10^(-23) g

8 0

3 years ago

Write the balanced net ionic equation for the reactions that occur when the given aqueous solutions are mixed. Include the physi

Anestetic [448]

Answer:

a. 2 H⁺ (aq) + 2 OH⁻ (aq) → 2H₂O(l)

b. Pb²⁺(aq) + 2I⁻(aq) → PbI₂(s)

Explanation:

First of all, we must determine if the reactants produce precipitates:

A. HNO₃, Ca(OH)₂

B. Pb(NO₃)₂, KI

A. This is a neutralization reaction:

Acid + Base → Water and Salt

The net ionic equation shows, that water is produced

We dissociate the compounds:

HNO₃ → H⁺(aq) + NO₃⁻(aq)

Ca(OH)₂(aq) → Ca²⁺(aq) + 2OH⁻(aq)

Ionic complete equation:

2H⁺(aq) + 2NO₃⁻(aq) + Ca²⁺(aq) + 2OH⁻(aq) → Ca²⁺(aq) + 2NO₃⁻(aq) + H₂O(l)

Net ionic equation: 2 H⁺ (aq) + 2 OH⁻ (aq) → H₂O(l)

B. Pb(NO₃)₂, KI

We dissociate: Pb(NO₃)₂ (aq) → Pb²⁺(aq) + 2NO₃⁻(aq)

KI(aq) → K⁺(aq) + I⁻(aq)

Salts from nitrate are soluble but, when the iodide reacts, it can make a lead iodide precipitate

Ionic complete equation:

Pb²⁺(aq) + 2NO₃⁻(aq) + K⁺(aq) + 2I⁻(aq) → K⁺(aq) + 2NO₃⁻(aq) +PbI₂(s)

Net ionic equation: Pb²⁺(aq) + 2I⁻(aq) → PbI₂(s)

We cancel the repeated ions

7 0

3 years ago

Extracted from olives, canola, and corn are plant lipids and are liquid at room temperature.

Aleks [24]

Answer:

Explanation:

Oils are viscous liquids at room temperature, with high carbon and hydrogen content. Vegetable oils in this case are triglycerides extracted from plants seeds or fruit.

So we'd have olive oils, canola oils and corn oils.

I hope this explanation is clear and simple.

5 0

3 years ago

Problem 3

prisoha [69]

Answer:

774.265 kJ

Explanation:

Given an endothermic reaction in which 4 moles of production of ammonia requires 1170 kJ amount of energy . each mole of ammonia corresponds to 17grams. which means that 68 grams of ammonia production requires 1170 kJ amount of energy .

we are asked to find out the heat energy assosiated with the production of 45gms of ammonia let us calculate the heat energy assosiated with per gram production of ammonia that is one gram of ammonia synthesis reqires $\dfrac{1170}{68}$ amount of energy .Then 45 gms require $45\times \dfrac{1170}{68}$ amount of energy which is equal to 774.265kJ

7 0

4 years ago

Conduction happens as energy flows from a warmer object to a cooler object. Which of the following is evidence of conduction?

Dmitrij [34]

Explanation:

Conduction is a form of heat transfer between one body and another. It usually occurs when a warmer object is in contact with a cooler one. Heat generally flows from a region of high temperature to a place at a lower temperature.

Conduction is very pronounced in solid bodies.
The heat transfer causes a net transfer of the average kinetic energy of one body to the other.
Some examples are: heating of iron by a hotter metallic body, the pot hand getting hotter as cooking continues, cooling of ice by touching it.

8 0

3 years ago