Which type of wave has a disturbance that moves parallel to direction the energy in the waves travels?
1 answer:
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Answer: The correct option is A.
Explanation: Moles of Iron nail can be calculated by using the formula:
...(1)
Given mass of iron nail = 100 g
Molar mass of iron = 56 g/mol
Number of moles of iron nail = 1.79 moles
The chemical equation for the formation of rust if given by:
By Stoichiometry of the reaction,
4 moles of iron reacts with 3 moles of oxygen gas to produce 2 moles of rust.
So, 1.79 moles of iron will react with = = 1.3425 moles of oxygen gas.
For oxygen gas,
Molar mass = 32 g/mol
Mass of oxygen can be calculated by using equation 1, we get
Mass of oxygen gas = 43 grams
Hence, the correct option is a.
Answer: [tex]CO_2(s)\rightarrow CO_2(g)[/tex]
Explanation:
Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.
is positive when randomness increases and
is negative when randomness decreases.
a)
2 molesof gas are converting to 2 moles of another gas , thus is zero.
b)
1 mole of solid is converting to 1 mole of liquid, the randomness increases and thus is positive.
b)
2 moles of ions are converting to 1 mole of solid, the randomness decreases and thus is negative
d)
1 mole of solid is converting to 1 mole of gas, the randomness increases drastically and thus is highly positive.