The answer is 64.907 amu.
The atomic mass of an element is the average of the atomic masses of its isotopes. The relative abundance of isotopes must be taken into consideration, therefore:
atomic mass of copper = atomic mass of isotope 1 * abundance 1 + atomic mass of isotope 2 * abundance 2
We know:
atomic mass of copper = 63.546 amu
The atomic mass of isotope 1 is: 62.939 amu
The abundance of isotope 1 is: 69.17% = 0.6917
The atomic mass of isotope 1 is: x
The abundance of isotope 2: 100% - 69.17% = 30.83% = 0.3083
Thus:
63.546 amu = 62.939 amu * 0.6917 + x * 0.3083
63.546 <span>amu = 43.535 amu + 0.3083x
</span>⇒ 63.546 amu - 43.535 amu = 0.3083x
⇒ 20.011 amu = 0.3083x
⇒ x = 20.011 amu ÷ 0.3083 = 64.907 amu
Answer:
69.8 kilo Pasacl is the pressure of the hydrogen gas.
Explanation:
Pressure at which hydrogen gas collected = p = 101.2 kilo Pascals
Vapor pressure water = 
= 31.4 kilo Pascals
The pressure of hydrogen gas = P
The pressure at which gas was collected was sum of vapor pressure of water and hydrogen gas.
69.8 kilo Pasacl is the pressure of the hydrogen gas.
A chemical reaction is going to be your answer
Answer:
Hi there!
Your answer is:
A raccoon is a secondary consumer because it most commonly eats animals! It's food eats plants, making it's food a primary consumer. A raccoon is the second animal in the chain to eat!
I hope this helps!
Answer:
The answer to your question is Percent by mass = 43.2
Explanation:
Data
Ca(OH)₂
Percent by mass of Oxygen = ?
Process
1.- Calculate the molecular mass of Ca(OH)₂
Ca(OH)₂ = (40 x 1) + (16 x 2) + (2 x 1)
= 40 + 32 + 2
= 74 g
2.- Calculate the mass of Oxygen = (16 x 2)
= 32 g
3.- Calculate the percent by mass
Percent by mass = (mass of oxygen/mass of Ca(OH)₂) x 100
Percent by mass = (32/74) x 100
Percent by mass = 43.2
