Answer:
15.4 g
Explanation:
Let's consider the decomposition of calcium carbonate to form carbon dioxide.
CaCO₃ → CaO + CO₂
Step 1: Calculate the moles of carbon dioxide
Since the conditions are not explicit, we will suppose that CO₂ is at standard temperature and pressure (STP). In these conditions, <em>1 mole of any gas has a volume of 22.4 L</em> (assuming ideal behavior).
Step 2: Calculate the moles of calcium carbonate
<em>The molar ratio of CaCO₃ to CO₂ is 1:1.</em> Then, the moles of CaCO₃ required are 0.154 moles.
Step 3: Calculate the mass of calcium carbonate
<em>The molar mass of CaCO₃ is 100.09 g/mol.</em> Then,
<h2>
Answer: Mg²⁺ & N³⁻</h2>
<h3>
Explanation:</h3>
Magnesium (group IIA) loses two electrons to become a cation. This is the most energetically favorable way for Magnesium to obtain a valence electron that is stable (octet). When an atom loses electrons it has a positive charge that matches the number of electrons lost.
Nitrogen (group VA) gains three electrons to become an anion. This is the most energetically favorable way for Nitrogen to obtain a valence electron that is stable (octet). When an atom gains electrons it has a negative charge that matches the number of electrons gained.
The process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
Answer:
The Sun and the planets were born from a cloud of gas and dust called the solar nebula 4.6 billion years ago. The collapse of the solar nebula was most likely triggered by a shock wave from a nearby supernova explosion. The Sun formed in the center, with the planets surrounding it in a thin disk.
Explanation:
