Answer: Thus for the conversion of gray tin to white tin is -20.9 kJ
Explanation:
According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.
According to this law, enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.
The final reaction is
The intermediate balanced chemical reaction will be,
(1)
(2)
substarcting (2) form (1) we get
<h3><u>Answer;</u></h3>
= 1.183 × 10^25 atoms
<h3><u>Explanation;</u></h3>
Volume of a cylinder is given by the formula;
πr²h , where r is the radius, and h is the height or length.
Volume = 3.14 × 2.5² × 10
= 196.25 cm³
But density = 2.7 g/cm³
Therefore;
Mass = volume × density
= 196.25 × 2.7
= 529.875 g
But; 1 atom = 4.48 x 10-23 g
Therefore;
Number of atoms = 529.875 g / 4.48 x 10-23 g
<u>= 1.183 × 10^25 atoms</u>
Answer:
A
Explanation:
There are 2 sodium atoms and 1 oxygen atom.
Answer: PCl₃O
Explanation:
1) The chemical formula tells the composition of a compound in terms of the ratio of number of atoms of each element that consitutes such compound.
2) You use the chemical symbol for each kind of atom (element) and subscripts to the right of each symbol to tell the number of atoms of each element.
3) For example, O₂ means two atoms of oxygen. Al₂O₃ means two atoms of aluminum and 3 atoms of oxygen.
4) Therefore, PCl₃O means a ratio 1 : 3 : 1 for phosphorus, chlorine, and oxygen.
Hence, PCl₃O is the chemical formula of your compound.
It is part of oceans, air, rocks, soil and all living things. Carbon doesn't stay in one place. It is always on the move! In the atmosphere, carbon is attached to oxygen in a gas called carbon dioxide.
Hope this helps.