E. Work out the percentage composition of
constituents elements in the following
compounds :
a. Lead phosphate [Pb (PO)],
b. Potassium dichromate (K,Cr,02),
c. Macrocosmic salt - Sodium
ammonium hydrogen phosphate,
tetrahydrate (NaNH HPO .4H,O)
(At. mass : Pb = 207; P=31; 0 = 16;
K = 39; Cr = 52; Na = 23; N = 14)
Answers
Answered by
116
Answer:
Explanation:First calculate molar mass of lead phosphate
Which you'll get 811g/mol
Use mass percentage formula
1) mass percent of pb = mass of pb÷mass of lead phosphate×100
=207g÷811g/mol×100
=25.52
Now multiply this no by number of pb present in lead phosphate
25.52×3 =76.57%
2) similarly, find for p
mass percent of p = mass of p÷mass of lead phosphate×100
=31g÷811g/mol×100
=3.82×no of p atoms present in lead phosphate
=3.82×2
=7.64%
3) mass percent of O = mass of O÷mass of lead phosphate×100
=16g÷811g/mol×100
=1.97×no of oxygen atom present in lead phosphate
=15.78%
Answered by
15
Answer:mass percent of k:72.88%,mass percent of cr:97.19%&mass percent of o:366.35%
Explanation: potassium dichlorate (K2Cr2O7)
...............,
Similar questions