First step: The mass of zinc in the yellow zinc sample can be calculated with the help of percentage (given) in the sample. After that, mass of copper is determine by the subtracting the mass of zinc from the total mass of zinc in the given sample.
Thus,
Mass of zinc in 34% zinc sample = 
= 
zinc
Mass of zinc in 37% zinc sample = 
= 
zinc
Now,
mass of copper in 34% zinc sample =
= 
mass of copper in 37% zinc sample = 
=
Thus, the range of mass of copper is 
to 
Second step:
34% zinc sample consist of 66% copper (100-34= 66%)
37% zinc sample consist of 63% copper (100-37=63%)
Mass of zinc = 
= 
Mass of zinc =
= 
Thus, the range of mass of zinc is 
to 
Answer:
The number of hamburgers is 109.
Explanation:
Let h = number of hamburgers
Let c = number of cheeseburgers
The total number sold gives us the equation below.
h + c = 327
"The number of cheeseburgers sold was two times the number of hamburgers sold.
This gives us the equation
c = 2h
Now we substitute c with 2h in the first equation and solve for h.
h + 2h = 327
3h = 327
h = 109
The number of hamburgers is 109.
<span>2.70x10^7 pm^3
We will assume that the sodium atom closely approximates a sphere. So the expression for the volume of a sphere is
V = 4/3 pi r^3
V = 4/3 pi (186 pm)^3
V = 4/3 pi 6434856 pm^3
V = 26954261.78 pm^3
Round to 3 significant figures, giving 2.70x10^7 pm^3</span>
So yield = actual/predicted*100
You need to find the theoretical yield. CONVERT INTO MOLES. this is the 1st step you do in most calculation questions.
I got 15.92%
