Its A. because it measures the rate of the decay of the isotope
Answer:
The Density of the cube of metal is 2.675g/mL or 2675kg/mL.
Explanation:
Given the following data;
Mass of metal = 1.45kg to gram (g) = 1.45 × 1000 = 1450g
Volume of the cube of metal = 542mL
Density = ?
Density can be defined as mass all over the volume of an object.
Simply stated, density is mass per unit volume of an object.
Mathematically, density is given by the equation;
![Density = \frac{mass}{volume}](https://tex.z-dn.net/?f=Density%20%3D%20%5Cfrac%7Bmass%7D%7Bvolume%7D)
Substituting into the equation, we have;
![Density = \frac{1450}{542}](https://tex.z-dn.net/?f=Density%20%3D%20%5Cfrac%7B1450%7D%7B542%7D)
<em>Density = 2.675g/mL</em>
In kilograms, the density is 2.675 x 1000 = 2675kg/mL.
Answer:
Your answer choice is D
Explanation:
I just got it right on USATestprep :))
Answer:
(a) 1.92 moles of Bi produced.
(b) 80.6 grams
Explanation:
Balanced equation: Bi2O3(s) + 3C(s) → 2Bi(s) + 3CO(g)
1st find moles of Bi2O3:
Bi2O3 has Mr of 466 and mass of 447 g
![\hookrightarrow moles = \frac{mass}{Mr}](https://tex.z-dn.net/?f=%5Chookrightarrow%20moles%20%3D%20%5Cfrac%7Bmass%7D%7BMr%7D)
![\hookrightarrow moles = \frac{447}{466}](https://tex.z-dn.net/?f=%5Chookrightarrow%20moles%20%3D%20%5Cfrac%7B447%7D%7B466%7D)
2nd find moles of Bi:
Bi2O3 : 2Bi
→ 1 : 2 ------ this is molar ratio.
→ 0.959227 : (0.959227)*2
→ 0.959227 : 1.91845
→ 0.959227 : 1.92
Therefore 1.92 moles of Bi was produced.
3rd Find moles of 3CO:
Bi2O3 : 3CO
1 : 3
0.959227 : (0.959227 )*3
0.959227 : 2.87768
3CO has 2.87768 moles and we know the Mr is 28.
![\hookrightarrow mass = moles * Mr](https://tex.z-dn.net/?f=%5Chookrightarrow%20mass%20%3D%20moles%20%2A%20Mr)
![\hookrightarrow mass = 2.87768 * 28](https://tex.z-dn.net/?f=%5Chookrightarrow%20mass%20%3D%202.87768%20%2A%2028)
g
Therefore 80.575 grams of CO was produced.