To find the number of moles in 30 grams of H3PO4, divide the mass by the molar mass. In this case, there are 0.306 moles of H3PO4.
To determine the number of moles in 30 grams of H3PO4, we need to use the molar mass of H3PO4. The molar mass of H3PO4 is 98.0 g/mol.
We can use the following conversion factor to convert grams to moles: 1 mole = molar mass (in grams).
Therefore, the number of moles in 30 grams of H3PO4 is calculated as:
30 grams x (1 mole / 98.0 grams) = 0.306 moles of H3PO4.
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The exothermic step in ozone reactions is O₃ → O₂ + O. The most endothermic step is 3O₂ → 2O₃ because it needs energy to break the double bond in O₂. Ozone can be decomposed by light with a longer wavelength because the O-O bond in ozone is weaker than the O=O double bond in oxygen.
The reactions mentioned are involved in the ozone production and destruction in the atmosphere. The first reaction : 3O₂ → 2O₃ is an endothermic process as it needs energy (in the form of UV light) to break the double bond in O₂ and form O₃. However, the reaction : O₃ → O₂ + O is exothermic. It involves the breaking of the weaker bond in O3 and formation of a stronger O₂ molecule and oxygen atom. Thus, the answer to part (a) would be the step O₃ → O₂ + O.
For part (b), the most endothermic step would again be 3O₂ → 2O₃. Lastly, the explanation of why ozone can be decomposed by light with a longer wavelength than that required to decompose oxygen is because the O-O bond in ozone is weaker than the O=O double bond in oxygen. Hence, it requires less energy (or light of longer wavelength) to break the O-O bond in ozone, leading to its decomposition.
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The answer to your question is D. none of the above. Ionic compounds are compounds composed of ions, charged particles that form when an atom (or group of atoms) gains or loses electrons. (A cation is a positively charged ion; an anion is a negatively charged ion.) Covalent or molecular compounds form when elements share electrons in a covalent bond to form molecules. I hope this helps.
Answer:
The answer is C. a metal and a nonmetal.
Explanation:
A covalent compound is formed when an element shares its valence electron with another element. This bond is formed between two non metals. Example:
An ionic compound is formed when one element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This bond is formed between a metal and an non-metal. Example:
Thus an ionic compound is typically made of a metal and a nonmetal.
A: the Oxygen has a partial negative charge which attracts atoms and molecules that have a position or partial positive charge
B: The Hydrogen has a partial negative charge which attracts atoms and molecules that have a positive or partial positive charge
C: Because Oxygen is extremely electronegative it attracts atoms and molecules with a negative or partial negative charge
D: Because Hydrogen has a very low electronegative rating it attracts atoms and molecules with a positive or partial positive charge
Considering the definition of hydrogen bond, the correct answer is option A: he Oxygen has a partial negative charge which attracts atoms and molecules that have a position or partial positive charge.
In hydrogen bonds, a molecule that presents hydrogen interacts with another that presents an atom with high electronegativity, such as oxygen, fluorine or nitrogen (O, F, N). In this way, between the hydrogen, which has a low electronegativity and the electronegative atom, an interaction is established, due to their opposite charges.
On the other hand, electronegativity is the ability of an atom to attract shared electrons in a covalent bond.
In the case of water, because oxygen is more electronegative than hydrogen, electrons, which have a negative charge, are more likely to be closer to the oxygen atom than to the hydrogen atom, which causes each hydrogen atom to have a positive charge is called a positive partial charge, and that of oxygen, a negative charge, since it has the electrons closer together.
In summary, the correct answer is option A: he Oxygen has a partial negative charge which attracts atoms and molecules that have a position or partial positive charge.
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Answer:
Opposite charges attract one another. The slight positive charges on the hydrogen atoms in a water molecule attract the slight negative charges on the oxygen atoms of other water molecules. This tiny force of attraction is called a hydrogen bond.