If the Density of an object is 5.2 g/cm 3 , and its volume is 3.7 cm 3 , what is its mass?
2 answers:
Answer: mass = 19 grams
Explanation: Density is directly proportional to mass and indirectly proportional to the volume. So, the density formula is:
density and volume are given and the question asks to calculate the mass. So, the formula could be rearranged as:
mass = density x volume
Given density is and the volume is
.
Let's plug in the values in the formula to calculate the mass:
mass =
mass = 19.24 grams
Both the density and volume have two sig figs, so if the answer is round off to correct number of sig figs then the mass will be 19 grams.
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Answer:
Here's what I get
Explanation:
The ionization energy (I) is the energy required to remove an electron from an atom in the gaseous phase.
You can remove electrons in succession and measure the energies required as I₁, I₂, I₃, etc.
Thus, the removal of two electrons from Cu gives you Cu²⁺.
I found the ionization energies of Cu and used them to create those of Cu²⁺ (see table and graph below).
The electron configuration of Cu²⁺ is
Cu²⁺: 1s² 2s²2p⁶ 3s²3p⁶ 3d⁹
You can remove the nine 3d electrons and then there is a sudden jump from I₉ to I₁₀ as you break into the filled [Ar] configuration.
Similarly, there is big jump from I₁₇ to I₁₈ as you break into the filled [Ne] configuration.
27.9L
Explanation:
Given parameters:
Number of molecules = 7.5 x 10²⁴molecules
Condition = STP
Unknown:
Volume of gas = ?
Solution;
The volume of gas at STP is expressed below;
Volume of gas = number of moles x 22.4
Number of moles =
Now if we can obtain the value of the number of moles from the expression above, we can plug it back into the equation of the volume of gas at STP;
Number of moles of NH₃ = }{6.02 x 10^{23} }[/tex]
Number of moles of NH₃ = 12.5moles
Volume of gas = 12.5 x 22.4 = 27.9L
learn more:
Volume of gas at STP brainly.com/question/7795301
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