All categories

2 years ago

A 0.55 g sample of H20 contains how manymolecules of water?Answer in units of molec.

Chemistry

1 answer:

noname [10]2 years ago

7 0

Answer:

Explanation:

Num of molecules = num of moles * Avogadro's constant (6.02* 10^23)

But num of moles = reacting mass / molar mass

Molar mass of H20= 2*1 + 16 = 2+16 = 18g

Reacting mass of H20 = 0.55g

Therefore, num of moles of H20 = 0.55g/18g = 0.031 moles

Therefore, num of molecules of H20 = 0.031 * 6.02*10^23

= 1.87*10^22 molecules of H20

You might be interested in

Why do plants need sap

Vinil7 [7]

Plants don't need sap. Plants produce sap and attract bugs.

7 0

2 years ago

Read 2 more answers

Calculate the ph of sweater which has a hydrogen ion concentration of 1 times 10 to the power of 8

telo118 [61]

Answer:

The pH of the sweater containing Hydrogen ion concentration

$[H^{+}]=1\times 10^{-8}$ is

8

Explanation:

pH = It is the negative logarithm of activity (concentration) of hydrogen ions.

pH = -log([H+])

Now, In the question the concentration of [H+] ions is :

$[H^{+}]=1\times 10^{-8}$

$pH = -log(1\times 10^{-8})$

use the relation:

$log(10^{-a})=a$

$pH= -(-8)$

pH = 8

Note : 1 times 10 to the power of 8 must be" 1 times 10 to the power of -8"

If the concentration is

$[H^{+}]=1\times 10^{8}$

Then pH = -8 , which is not possible . So in that case the pH calculation is by other method

5 0

2 years ago

Freshwater is distributed in both time and space

Neko [114]

Answer:

Unevenly

Explanation:

Fresh water is distributed unevenly in both time and space.

7 0

1 year ago

How many moles of atoms are contained in the following 2.25g of k

ZanzabumX [31]

Atomic mass (K)= 39.1 amu

therefore:
1 mol (k)---------------------39.1 g
x------------------------------- 2.25 g

x=(1 mol * 2.25 g) / 39.1 g=0.05754....≈0.06 moles

Answer: 0.06 moles.

8 0

3 years ago

When lithium and fluorine combined, what is the compound form

VashaNatasha [74]

Lithium fluoride is the compound name

7 0

2 years ago

Read 2 more answers

A 0.55 g sample of H20 contains how manymolecules of water?Answer in units of molec.​

A 0.55 g sample of H20 contains how manymolecules of water?Answer in units of molec.