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3 years ago

7

How many formula units are present in 25.0 mol of sodium chloride

1 answer:

bonufazy [111]3 years ago

7 0

The way to work out formula units is to do the amount of moles (in this case 25) times by 6.022 x 10^23. so, the answer is 1.5055 x 10^25 formula units. hope this helps! (by the way ^ represents ‘to the power of’ because i cant get the smaller symbols on here)

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Explanation: Please mark branliest.

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3 years ago

An atom of nitrogen has seven electrons. I hitch diagram correctly represents the arrangement of these electrons?

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3 years ago

A small portion of a crystal lattice is sketched below. What is the name of the unit cell of this lattice? Your answer must be a

Nikolay [14]

This is an incomplete question, the given sketch is shown below.

Answer : The name of given unit cell is, FCC (face-centered cubic unit cell)

Explanation :

Unit cell : It is defined as the smallest 3-dimensional portion of a complete space lattice which when repeated over the and again in different directions produces the complete space lattice.

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BCC (body-centered cubic unit cell)
FCC (face-centered cubic unit cell)

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The number of atoms of unit cell = Z = 1

In BCC, the atoms are arranged at the corners and the body center.

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The number of atoms of unit cell = Z = 4

Thus, the name of given unit cell is, FCC (face-centered cubic unit cell)

7 0

3 years ago

What is the chemical reaction in the equation NaCl (s) → Na + (aq) + Cl - (aq)

kondor19780726 [428]

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exothermic reaction

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6 0

3 years ago

A reaction at −8.0°C evolves 854.mmol of boron trifluoride gas. Calculate the volume of boron trifluoride gas that is collected.

Bas_tet [7]

Answer: The volume of boron trifluoride gas that is collected is 18.6 L

Explanation:

According to the ideal gas equation:

PV=nRT

P = Pressure of the gas = 1 atm

V= Volume of the gas= ?

T= Temperature of the gas in kelvin = $-8.0^0C=273+(-8.0)=265K$

R= Gas constant = $0.0821Latm/Kmol$

n= moles of gas= 854 mmol = 0.854 mol (1mmol=0.001mol)

$1atm\times V=0.854\times 0.0821\times 265$

$V=18.6L$

Thus volume of boron trifluoride gas that is collected is 18.6 L

5 0

2 years ago