The mass percent of hydrogen in diethyl ether is 1.36%.
To calculate the mass percent of hydrogen in diethyl ether, we need to determine the mass of hydrogen in the compound and divide it by the total mass of diethyl ether. The formula of diethyl ether is C4H10O, so the molar mass is 74.12 g/mol. The molar mass of hydrogen is 1.008 g/mol.
Mass percent of hydrogen = (mass of hydrogen / mass of diethyl ether) × 100%
Mass percent of hydrogen = (1.008 g/mol / 74.12 g/mol) × 100% = 1.36%
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(3) the mass of neutrons in grams
(4) the number of neutrons in grams
Answer: option (1) the atomic mass in grams.
Explanation:
1) The atomic mass is the mass in grams of one mole of atoms.
2) Hence, it is always the atomic mass of an element equal to the mass of one mole of atoms of such element. Therefore, the atomic mass of Au is the mass of one moles of atoms of Au.
3) Here are some examples:
i) Atomic mass of gold: 196.67 g/atoms, means that 196.97 grams of Au is one mole of Au.
ii) Atomic mass of hydrogen: 1.008 g/mol, means that 1.008 grams of H is one mole of H.
iii) Atomic mass of oxygen: 15.999 g/mol, means that 15.999 grams of O is one mole of O.
iv) Atomic mass of lead: 207.2 g/mol, means that 207.2 grams of Pb is one mole of Pb.
Now you see it, the atomic mass in grams of an element is equal to one mole of the element.
B. Drying wood in a shed
C. Melting ice to obtain water
D. Evaporating alcohol into vapor
Coal combustion causes a chemical change. Burning coal in a furnace will result in a chemical change. Therefore, option A is correct.
A chemical change is the transformation of one material into another, the formation of new materials with different properties, and the formation of one or more new substances. It occurs when one substance reacts with another to form a new substance.
Coal combustion causes a chemical change. The main component, carbon, is converted to carbon dioxide when coal is burned. This process is irreversible.
When carbon is burned, it produces carbon dioxide, and hydrogen produces water. Each of these reactions generates a different amount of heat. Because this process cannot be reversed, coal combustion is a chemical change.
Thus, option A is correct.
To learn more about chemical change, follow the link;
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b. gained.
c. shared.
d. transferred.?
Covalent bonds share electrons while ionic bonds transfer their electrons.
B. reduction
C. substitution
D. condensation
Answer: Option (B) is the correct answer.
Explanation:
When an atom gains electrons then it becomes rich in electrons and therefore it acquires a negative charge.
Also, it is known that a reduction reaction is a reaction in which an element gain electron(s).
For example, is a reduction reaction.
Thus, we can conclude that when nonmetal atoms become negative nonmetal ions then type of reaction which occurs is reduction reaction.