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kitttimothy55
16.12.2020 •
Chemistry
The first molecule the student constructs is that for water. An image of the model is shown.
The model indicates that water is a molecule.
o linear
O trigonal planar
O bent
O tetrahedral
Solved
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Ответ:
Reminders:
•Linear would mean that it is completely straight
•Trigonal planar would mean that there’s 3 bonds attached to the centre atom (in this case it’s oxygen)
•Tetrahedral would mean that there’s 4 bonds attached to the centre atom
Ответ:
The mass of unknown acid needed is 0.230 grams
Explanation:
To calculate the number of moles for given molarity, we use the equation:
Molarity of NaOH solution = 0.100 M
Volume of solution = 15.00 mL = 0.015 L (Conversion factor: 1 L = 1000 mL)
Putting values in above equation, we get:
The chemical reaction for the reaction of KHP and NaOH follows
By Stoichiometry of the reaction:
1 mole of NaOH reacts with 1 mole of KHP.
So, 0.0015 moles of NaOH will react with =
of KHP
To calculate the number of moles, we use the equation:Moles of KHP = 0.0015 moles
Molar mass of KHP = 204.22 g/mol
Putting values in above equation, we get:
We are given:
Mass of unknown acid = 75 % of Mass of KHP
So, mass of unknown acid =![\frac{75}{100}\times 0.306=0.230g](/tpl/images/0523/6330/3636c.png)
Hence, the mass of unknown acid needed is 0.230 grams