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MatroZZZ [7]
3 years ago
11

What is the water vapor density maximum at 30 ᵒC? *

Chemistry
1 answer:
riadik2000 [5.3K]3 years ago
8 0

2.3 mol/1000L

Explanation:

relative humidity (rh)is the ratio of the partial pressure of water at a given temprature

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Calculate the mass of magnesium oxide produced when 0.645 g of magnesium hydroxide is the is completely decomposed.
FrozenT [24]

Answer:

0.44g

Explanation:

Given parameters:

Mass of magnesium hydroxide = 0.645g

Solution

The balanced reaction equation is shown below:

                             Mg(OH)₂ → MgO + H₂O

From the equation above, we see that the number of atoms are conserved.

To find the mass of magnesium oxide produced, we find the number moles of the decomposed magnesium hydroxide first:

      Molar mass of Mg(OH)₂ = 24 + 2(16+1) = 58g/mol

Number of moles of Mg(OH)₂ = \frac{mass}{molar mass}

                                                  =  \frac{0.645}{58}

                                                  = 0.011mole

Now, from the balanced equaiton, we know that:

     1 mole of Mg(OH)₂ produces 1 mole of MgO

Therefore, 0.011mole of Mg(OH)₂ will produce 0.011mole of MgO

so mass of MgO = number of moles of MgO x molar mass of MgO

   Molar mass of MgO = 24 + 16 = 40g/mol

     mass of MgO = 0.011 x 40 = 0.44g

8 0
4 years ago
What is DNA fingerprinting?<br> FORENSICS
Zinaida [17]

Answer:

<em>It is a method used to identify a suspect.</em>

Explanation:

<em>DNA fingerprinting is a method used to identify an individual from a sample of DNA by looking at unique patterns in their DNA.</em>

<em />

4 0
3 years ago
Completion
Snowcat [4.5K]

Answer:

  1. Compress
  2. Fixed
  3. Melts
  4. Melting Point
  5. Freezing Point
  6. High
  7. Crystalline
  8. Lattice
  9. Unit cell
  10. Amorphous solids

Explanation:

Solids tend to be dense and difficult to <u>compress.</u>

They do not  flow or take the shape of their containers, like liquids do, because  the particles in solids vibrate around <u>fixed</u> points.

When a solid  is heated until its particles vibrate so rapidly that they are no longer  held in fixed positions, the solid <u>melts</u>.  

<u>Melting point</u> is the  temperature at which a solid changes to a liquid. The melting and <u>freezing point</u>  of a substance are at the same temperature.

In general,  ionic solids tend to have relatively <u>high</u>  melting points, while  molecular solids tend to have relatively low melting points.

Most  solids are <u>crystalline</u>

The particles are arranged in a pattern known  as a crystal <u>lattice</u>

The smallest subunit of a crystal lattice is the <u>unit cell</u>  

Some solids lack an ordered internal structure   and are called <u>amorphous solids.</u>

7 0
3 years ago
Question 2
Naddika [18.5K]

Answer:

38.4 atm

Explanation:

Data obtained from the question include:

V1 (initial volume) = 3200 L

P1 (initial pressure) = 3.00 atm

V2 (final volume) = 250.0 L

P2 (final pressure) = ?

Using Boyle's law equation P1V1 = P2V2, the final pressure can be obtained as follow:

P1V1 = P2V2

3 x 3200 = P2 x 250

Divide both side by 250

P2 = 3 x 3200/250

P2 = 38.4 atm

Therefore, the pressure of the gas if ethylene is supplied by a 250.0 L tank is 38.4 atm

5 0
4 years ago
Manganese has a total of 25 electrons, but the following orbital notation for manganese is incorrect. Explain the error in terms
laila [671]
The Orbital configuration for Manganese is as follows:

1s2 2s2 2p6 3s2 3p6 4s2 3d5

It says 3d is shown with five orbitals- this is correct

Then it says the first two orbitals have two electrons-this is incorrect. 

When filling in the orbitals for any element, you first need to distribute to ALL orbitals then extras go from there.

The orbital d can have up to 10 electrons so you need to distribute at least one electron to all ten. Since you only have 5 then only 5 orbitals would have electrons in them. In order for ANY of the orbitals to have two electrons, there would need to be AT LEAST 11 electrons to distribute. 
4 0
3 years ago
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