3 bc Hf is an element hafnium and HF is compound hydrogen flouride
When carbon dioxide reacts with water a weak acid is formed. Carbon dioxide is present in exhaled breath. Observing a colour change using an acid-base indicator shows the reaction between carbon dioxide and water.
1 mole --------- 22.4 L at ( STP )
? moles ------- 131.97 L
131.97 x 1 / 22.4 => 5.8915 moles
Therefore:
1 mole ------------- 6.02x10²³ atoms
5.8915 moles ----- ??
5.8915 x ( 6.02x10²³) / 1 =
= 3.5448x10²⁴ atoms
hope this helps!
Answer:
Competition
Explanation:
Peppered moths get their color in lieu to become the fittest among all so that they can survive easily. During industrial age, when pollution suddenly became high these moths changed their color through evolution in order to save themselves from their predators.
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