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3 years ago

Convert 812.4 kPa into atm

Chemistry

1 answer:

Crank3 years ago

6 0

Answer:

Explanation:

There are a series of unit used to measure PRESSURE. They include millimetre mercury (mmHg), atmospheric pressure (atm), kilopascal etc. These units of measurement are interconvertible i.e. can be changed from one unit to another.

Based on this question asking to convert

1 kilopascal = 0.00986923atm

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3 years ago

How many grams of lithium nitrate, LiNO3 (68.9 g/mol), are required to prepare 342.6 mL of a 0.783 M LiNO3 solution ? A) 0.00389

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Answer:

b) 18.5 g

Explanation:

The first step is the calculation of number of moles of $LiNO_3$ with the molarity equation, so:

$M=\frac{#~mol}{L}$

With the volume in "L" units (342.6 mL= 0.342 L ) we can find the moles, so:

$0.783~M\frac{#~mol}{0.342~L}$

$#~mol=~0.783*0.342=0.268~mol~LiNO_3$

Now, we have to calculate the molar mass to convert the moles to grams. For this we have to know the atomic mass of each atom:

Li ( 6.94 g/mol)

N (14 g/mol

O (16 g/mol)

With these values and the number of atoms in the molecule we can do the math:

(6.94 x 1) + ( 14 x 1) + (16 x 3 ) = 68.94 g/mol

The final step is the calculation of the grams, so:

$0.268~mol~LiNO_3~\frac{69.94~g~LiNO_3}{1~mol~LiNO_3}=~18.5~g~LiNO_3$

We will need 18.5 g of LiNO3 to do a 0.783 M solution with a volume 342.6 mL.

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3 years ago