Answer:
Atom has the tendency to attain stable electronic configuration of the nearest noble gas in accordance with the duplet and octet rule.hence,when an atom gains electron it becomes negatively charged and that is its negative charge making it an anion
Answer:
7.53×10²³ molecules
Explanation:
Given data:
Number of moles of carbonic acid = 1.25 mol
Number of molecules of CO₂ produced = ?
Solution:
Chemical equation:
H₂CO₃ → CO₂ + H₂O
Now we will compare the number of moles of carbonic acid with CO₂ from balanced chemical equation.
H₂CO₃ : CO₂
1 : 1
1.25 : 1.25
Number of molecules can be determine by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
Number of molecules:
1 mole = 6.022 × 10²³ molecules
1.25 mol × 6.022 × 10²³ molecules / 1 mol
7.53×10²³ molecules
Answer:
platinum-189 symbol is PT
(a) 43.6 mg; (b) 520 mg
(a) <em>Mass of phosphoric acid (PA) in a dose
</em>
Mass of PA = 2 tsp × (21.8 mg PA/1 tsp) = 43.6 mg PA
(b) <em>Mass of PA in the bottle
</em>
<em>Step 1</em>. Convert <em>ounces to millilitres
</em>
Volume = 4 oz × (30 mL/1 oz) = 120 mL
<em>Step 2.</em> Calculate the mass of PA
Mass of PA = 120 mL × (21.8 mg PA/5 mL) ≈ 520 mg PA
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