A 14.3 g sample of HF is dissolved into 250 mL of solution. The concentration of the solution is *
A. 2.86 M
B. 0.14 M
C. 7.1 M
D. 3.6 M

The concentration of the solution is 2.86 M

Explanation:

Molarity is a unit of concentration based on the volume of a solution. It is defined as the number of moles of solute that are dissolved in a given volume. In other words, molarity is defined as the number of moles of solute per liter of solution.

The Molarity of a solution is determined by the following expression:

Molarity is expressed in units ().

In this case, you must then know the number of moles of HF, for which you must know the molar mass. Being:

the molar mass of HF is: HF= 1 g/mole + 19 g/mole= 20 g/mole

Then the following rule of three applies: if 20 g of HF are available in 1 mole, 14.3 g in how many moles will they be?

moles= 0.715

So:

Replacing:

Solving:

Molarity= 2.86 =2.86 M

The concentration of the solution is 2.86 M

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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