1 answer

(3) 3. How many grams of oxygen are present in a sample containing 5.75 x 1021...

Question:

(3) 3. How many grams of oxygen are present in a sample containing 5.75 x 1021 formula units of manganese (II) phosphate ? (6
(3) 3. How many grams of oxygen are present in a sample containing 5.75 x 1021 formula units of manganese (II) phosphate ? (6) 4. Determine the percent composition (by mass) for each element in ammonium dichromate, (NH4)2Cr2O7.

Answers

Q 3.

Answer 1.2224 gram oxygen

Q4.

Answer :

For Nitrogen 11.11 %

For Hydrogen 3.1746 %

For Chromium 41.2698 %

For Oxygen 44.44 %

Details answer given in the attachment...

Now we required onggen in gram. so molar mass of oxygen = 16 g/mol mass of oxygen = 7.64x10 mod x 16 g/mol mass of oxygen = 1Total mass of NH) Cr2O7 = 2529 So mass us of Hydrogen Ans %. -X100 % - 3.1746 252 Cromium no. of mass of cr atom= 2 I co atom

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