It is D because nitrate reacts with the calcium and since na has a 2+ charge and no3 has a - charge we need 2 no3 to balance out the charge hence a 2 is placed outside the no3 bracket.
Answer:
532 moles of O atoms.
Explanation:
Given data:
Number of moles of oxygen atom present = ?
Number of molecules of N₂O₅= 6.41×10²⁵ molecules
Solution:
First of all we will calculate the number of moles of N₂O₅.
1 mole = 6.022×10²³ molecules
6.41×10²⁵ molecules × 1 mol /6.022×10²³ molecules
106.4 mol
Number of atoms of O:
1 mole of N₂O₅ contain 5 moles of O atoms.
106.4×5 = 532 mol
Answer:
The answer is rather simple, if you understand electron configurations: the shape of the periodic table mimics the filling of the subshells with electrons.
Explanation:
Answer:
Element Symbol Atomic Mass # of Atoms Mass Percent
Oxygen O 15.9994 3 43.656%
Phosphorus P 30.973761 2 56.344%
Explanation: