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insens350 [35]
3 years ago
11

Which compound is soluble in water?(1) PbS (3) Na2S(2) BaS (4) Fe2S3

Chemistry
1 answer:
Anuta_ua [19.1K]3 years ago
6 0
Correct Answer: Na2S

Reason: 
The compound sodium sulfide i.e. Na2S is soluble in water. This compound gives strong alkaline aqueous solutions. On the other hand, the remaining three compounds i.e PbS, BaS and Fe2S3 are non-soluble in water. Often these compounds are also referred as sparingly soluble compounds. 
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This problem is providing us with the recommended maintenance dose of penicillin for children as 1.0 mg/kg/hr by injection. Thus, the delivery rate for a 40-pound child is required, if 10 mL of a 25 mg/mL solution of penicillin is added to a 100-mL bottle of saline. At the end, the result is 8.0 mL/hr:

<h3>Dimensional analysis:</h3>

In chemistry, dimensional analysis allows us to obtain a specific result given relevant information about it. Although a formula is not always provided, one can use the units as a reference for the calculations.

For example, this problem asks for the rate, in mL/hr, at which a child gets this dose, so the first step will be to get the mass of the child in kilograms:

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Learn more about dimensional analysis: brainly.com/question/10874167

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