21. Chlorophyll, the green colouring matter of plants contains 2.68% of magnesium by mass. Calculate
the number of magnesium atoms in 3.00 g of chlorophyll.
[Atoms mass of magnesium = 24.3 g/mol)
22. How many moles of magnesium phosphate, Mg: (PO4)2 will contain 0.25 mol of oxygen atoms.
(a) 0.02
(b) 3.125 x 10-2
(c) 1.25 x 102
(d) 2.5 x 102
3. Write down the electronic configuration of Cr2+ and Mnº. How many unpaid electrons are present?
. Elements of which groups of the periodic table are called p-block elements and why?
Why
Answers
Answer:
21) Mass of magnesium in 3.00 g of chlorophyll
=
100
2.68×3
=0.080g
24.3 g of Mg contain =6.02×10
23
atoms
0.080 g of Mg contain =
24.3
6.02×10
23
×0.080
=1.98×10
21 atoms
22) 3(po4)2, will contain 0.25 mole of oxygen atoms? 1 mole of Mg3(PO4)2 (molecule) contains 3 moles of Mg atoms, 2 moles of P atoms and 2X4 moles of O atoms. = 0.03125 moles.
HOPE IT HELPS U
KEEP SMILING ALWAYS
Explanation:
Answer:
Answer:
21) Mass of magnesium in 3.00 g of chlorophyll
=
100
2.68×3
=0.080g
24.3 g of Mg contain =6.02×10
23
atoms
0.080 g of Mg contain =
24.3
6.02×10
23
×0.080
=1.98×10
21 atoms
22) 3(po4)2, will contain 0.25 mole of oxygen atoms? 1 mole of Mg3(PO4)2 (molecule) contains 3 moles of Mg atoms, 2 moles of P atoms and 2X4 moles of O atoms. = 0.03125 moles.
HOPE IT HELPS U
KEEP SMILING ALWAYS