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Calculate the weight of the sample of crystalline soda Na2CO3 × 10H2O, which must be dissolved in a volumetric flask with a volume of 1000 mL, to obtain a mass fraction of the solute of 7%, with a density of 1.05 g /mL
Choose the correct answer: a. 7,35g b. 75,3g c. 19,83g d. 73,5g e. 198,3g...
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Jan 20
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Dr. Ahmed Hafez
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35 mL of distilled water was added to 15 mL of 0.5 mol/L aqueous ammonia solution. Specify the molar concentration of the equivalents of the resulting solution.
Choose the correct answer : a. 0,30 b. 0,25 c. 0,25 d. 0,20 e. 0,15...
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Jan 20
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Dr. Ahmed Hafez
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what is ophthalmology ?
Ophthalmology is the specialized field of medicine that focuses on the health of the eye. It includes the anatomy, ... among humans and animals. Can you explain in otherwise ?...
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Jan 20
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Ophthalamology
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Dr. Ahmed Hafez
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ophthalmology
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