Answer:
Protein Concentration is 2.82mg/L
Explanation:
According to Beer-Lambert's Law, Absorbance is directly proportional to the concentration.
However, the concentration of a solution can be determined from a calibration curve, in which Absorbance is plotted on the y-axis and the Concentration on the x-axis.
Plotting the best line, the equation of line is used
y = mx + c
where y is absorbance = 0.150
m is slope = 0.0163
x is concentration
c is intercept = 0.104
inserting the values from the question
y = mx + c
0.150 = 0.0163x + 0.104
0.0163x = 0.150 - 0.104
0.0163x = 0.046
Divide both sides by 0.0163
0.0163x/0.0163 = 0.046/0.0163
x = 2.82
Concentration of protein = 2.82 mg/L
Answer:moles or atom. The SI base unit for amount of substance is the mole. 1 mole is equal to 6.0221415E+23 atom. Note that rounding errors may occur, so always check the results.
Explanation:
Answer:
![\boxed {\boxed {\sf A. \ Nickel}}](https://tex.z-dn.net/?f=%5Cboxed%20%7B%5Cboxed%20%7B%5Csf%20A.%20%5C%20Nickel%7D%7D)
Explanation:
First, we must find the density of the unknown metal.
Density is found by dividing the mass by the volume.
![d=\frac{m}{v}](https://tex.z-dn.net/?f=d%3D%5Cfrac%7Bm%7D%7Bv%7D)
The mass of the metal is 89 grams and the density is 10 cubic centimeters.
![m= 89 \ g \\d= 10 \ cm^3](https://tex.z-dn.net/?f=m%3D%2089%20%5C%20g%20%5C%5Cd%3D%2010%20%5C%20cm%5E3)
Substitute the values into the formula.
![d=\frac{89 \ g}{10 \ cm^3}](https://tex.z-dn.net/?f=d%3D%5Cfrac%7B89%20%5C%20g%7D%7B10%20%5C%20cm%5E3%7D)
Divide.
![d= 8.9 \ g/cm^3](https://tex.z-dn.net/?f=d%3D%208.9%20%5C%20g%2Fcm%5E3)
Now we know the density and can identify the unknown metal.
- Nickel: 8.9 g/cm³
- Silver: 10.5 g/cm³
- Lead: 11.35 g/cm³
- Mercury: 13.55 g/cm³
The density matches nickel's density. Therefore, this metal must be <u>nickel.</u>
1 atom Mg, 2 atoms O and 2 atoms H.
1 + 2 + 2 = 5, so correct answer is C