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3 years ago

Which of the following elements does not form an ion with a charge of plus one hydrogen fluorine sodium or potassium

Chemistry

2 answers:

Reil [10]3 years ago

6 0

Answer:

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slavikrds [6]3 years ago

6 0

The answer is fluorine, it will have a charge of -1

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how many water (h2o) molecules are in a block of ice that has a mass of 59.5 g? how many atoms of hydrogen are present in this b

schepotkina [342]

Block of ice of mass 59.5g contains 19.87 ×10²³molecules and 39.75×10²³ atoms.

Molecular mass of Water is 18g/mol

No. of moles = Given mass /Molecular mass

No. of moles of water = 59.5/18 (Given, mass of block of ice is 59.5g)

= 3.3moles.

1mol of water contains 6.023×10²³ molecules of water.

Then,3.3 moles of water contains ,

3.3× 6.023×10²³= 19.87 ×10²³molecules.

1mol of water (H₂O) contains,2× 6.023×10²³ atoms of hydrogen

Then, 3.3 moles of water contains,

2×3.3× 6.023×10²³ = 39.75×10²³ atoms of hydrogen.

Thus, the molecules and atoms present in the block of ice of mass 59.5g is 19.87 ×10²³molecules and 39.75×10²³ atoms respectively.

To learn more about moles, refer this link

brainly.com/question/13314627

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2 years ago

The collision of one continental plate with another may produce what ?

vichka [17]

It causes earthquakes. I hope this helps you :]

7 0

4 years ago

An atom with 4 protons, 5 neutrons, and 4 electrons has an atomic mass of _____ amu. (Enter a whole number.)

STatiana [176]

I believe it would be the sum of protons & neutrons which equals 9 amu....

7 0

3 years ago

Read 2 more answers

ANSWER ASAP (20 POINTS)

SIZIF [17.4K]

Answer:

a chemical formula

Explanation:

5 0

3 years ago

Gold has an atomic weight of 196.97 g/mol, and a density of 19.3 g/cm3. Approximately how many atoms are in a spherical gold nan

ale4655 [162]

<u>Answer:</u> The number of atoms in spherical gold nano particle are $26.918\times 10^4$

<u>Explanation:</u>

To calculate the volume of sphere, we use the equation:

$V=\frac{4}{3}\pi r^3$

where,

r = radius of the sphere = $10nm=10^{-6}cm$ (Conversion factor: $1nm=10^{-7}cm$ )

Putting values in above equation, we get:

$V=\frac{4}{3}\times 3.14\times (10^{-6})^3\\\\V=4.19\times 10^{-18}cm^3$

To calculate mass of of the substance, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

Volume of gold = $4.19\times 10^{-18}cm^3$

Density of gold = $19.3g/cm^3$

Putting values in above equation, we get:

$19.3g/cm^3=\frac{\text{Mass of gold}}{4.19\times 10^{-18}}\\\\\text{Mass of gold}=8.0867\times 10^{-17}g$

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Mass of gold = $8.8067\times 10^{-17}g$

Molar mass of gold = 196.97 g/mol

Putting values in above equation, we get:

$\text{Moles of gold}=\frac{8.8067\times 10^{-17}g}{196.97g/mol}=4.47\times 10^{-9}moles$

According to mole concept:

1 mole of an element contains $6.022\time 10^{23}$ number of atom

So, $4.47\times 10^{-19}$ moles of gold will contain = $4.47\times 10^{-19}\times 6.022\times 10^{23}=26.918\times 10^4$ number of atoms.

Hence, the number of atoms in spherical gold nano particle are $26.918\times 10^4$

8 0

3 years ago