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In: Chemistry

Question:1 You dissolve 312 mg of a compound (AwBxCyDz) in water producing 14.31 mL of solution...

Question:1
You dissolve 312 mg of a compound (AwBxCyDz) in water producing 14.31 mL of solution and use the photometer and standard solutions to find that the concentration of the A is 1.24 x 10-2 M. The molar mass of A is 114.52 g/mol.

Moles of A in the solution sample:________________________________

Mass of A in the solution sample: _________________________________

Mass % of A in the compound: _______________________________

Moles of A in 100 grams of the compound: ________________________________



Question:2
The compound, AwBxCy, like all compounds has an oxidation number of 0 (zero). The oxidation number of A is +1, the oxidation number of B is +2, and the oxidation number of C is –1. If there are two moles of A for every 3 moles of C in one mole of the compound, what is the empirical formula of the compound?



Question:3
Given the compound, KwAlx(SO4)y(H2O)z. 100.00 grams of the compound contains 8.24 grams of potassium and 5.69 grams of aluminum. What is the formula of the compound?

Solutions

Expert Solution

weight of compound (AwBxCyDz) = 312 mg

volume in water = 14.31 mL

concentration of the A = 1.24 x 10-2 M.

means 1.24 x 10-2 moles in 1000ml water but we have 14.31 ml

moles of A will be there

1) Moles of A in 2.72 Moles of compound (AwBxCyDz) = 17.7 *10-5 moles

2)

The molar mass of A is 114.52 g/mol.

Mass of A in the solution sample = number of moles * molar mass = 17.7 *10-5 * 114.52 = 20.27 * 10-3

3) Weight of compound in the solution sample = 312*10-3g

Mass % of A in compound = (Mass of A / Total mass ) *100

= g = 6.4%

4) Weight of A in 100 grams of the compound = 6.4g

moles of A in 100 gram of compound = 6.4 / molar mass = 6.4 / 114.52 = 0.055moles

Second question

compound = AwBxCy

two moles of A for every 3 moles of C in one mole of the compound means

But for every 2A there will be 3 C

So for every 1 A There will be 3/2C in that case ABC3/2

But compound is neutral A is +1 and B is +2 and C is -1

in that case answer will be A4BC6

How ever, how many subpart will be there doesnt matter we have been told to answer first 4 question

I am happy to help but i have answered more than that (time is precious for us also)


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