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2 years ago

What is the number of molecules in 9.0 g of steam?

Chemistry

1 answer:

77julia77 [94]2 years ago

4 0

Steam is water (H2O)

The relative molecular mass of water has to be calculated:

Refer to periodic table for molar mass/relative atomic mass for every element

Hydrogen has molar mass of 1g but as it is H2 there are 2 moles so : 2*1g =2g

Oxygen has molar mass of 16g

So relative molecular mass of water equals 18g

To find the number of moles of water in 9g divide mass (9g) by relative molecular mass of water (18g) u get 0.5 moles .

1 mole = 6.03*10^23 particles (in this case molecules)Avogadro's number

So 0.5 *(6.03*10^23)= 3.015*10^23 molecules

9 gram of steam contain 3.015*10^23 H2O molecules.

Note: 9 gram of water whether as ice or liquid water or steam always contains 3.015*10^23 water molecules.

9 grams of ice or liquid water or steam have different volumes but same number of molecules . Probably u need a lot balloons filled with water vapour to get 9 grams whereas u need a small cube of ice to get these 9 grams .Ice is more dense than water vapour.

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Draw the best Lewis structure for NH3 by filling in the bonds, lone pairs, and formal charges. (Assign bonds, lone pairs, radica

kiruha [24]

Answer : The Lewis-dot structure of $NH_3$ is shown below.

Explanation :

Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.

In the Lewis-dot structure the valance electrons are shown by 'dot'.

The given molecule is, $NH_3$

As we know that hydrogen has '1' valence electron and nitrogen has '5' valence electrons.

Therefore, the total number of valence electrons in $NH_3$ = 5 + 3(1) = 8

According to Lewis-dot structure, there are 6 number of bonding electrons and 2 number of non-bonding electrons.

Now we have to determine the formal charge for each atom.

Formula for formal charge :

$\text{Formal charge}=\text{Valence electrons}-\text{Non-bonding electrons}-\frac{\text{Bonding electrons}}{2}$

$\text{Formal charge on N}=5-2-\frac{6}{2}=0$

$\text{Formal charge on }H_1=1-0-\frac{2}{2}=0$

$\text{Formal charge on }H_2=1-0-\frac{2}{2}=0$

$\text{Formal charge on }H_3=1-0-\frac{2}{2}=0$

Hence, the Lewis-dot structure of $NH_3$ is shown below.

3 0

3 years ago

is there a relationship between the relative age of stars in the number/identity of element is found within them

lukranit [14]

Yes. Stars use fusion to create nuclear energy, which is what makes them "alive". The older they are, the "bigger" the element in them is. Hydrogen turns into Helium, and when hydrogen is used up, the helium starts fusing into bigger elements. it stops at iron however. Once stars start fusing silicon to iron, it is doomed because it takes more energy than it gives off.

8 0

3 years ago

1. A physician ordered 2.0 milligrams tetracycline to be given to a patient. If the tetracycline was available as 0.75 mg/mL of

Cerrena [4.2K]

Answer:

2.67 mL

Explanation:

The following data were obtained from the question:

Mass of tetracycline = 2 mg

Density of tetracycline = 0.75 mg/mL

Volume of tetracycline =?

We can obtain the volume of the tetracycline that should be given to the patient by applying the following equation:

Density = mass /volume

0.75 = 2 / volume

Cross multiply

0.75 × Volume = 2

Divide both side by 0.75

Volume = 2/0.75

Volume = 2.67 mL

Therefore, the volume of the tetracycline that should be given to the patient is 2.67 mL

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3 years ago

Porque la gasolina cintemos plomo?

AlladinOne [14]

I don’t see anything?

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3 years ago

If an atom has 15 protons, 11 neutrons, and 16 electrons, what is the atom's electrical charge? A. -5 B. -1 C. +1 D. +5

Helen [10]

Answer:

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Explanation:

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3 years ago