Answer:
Explanation:
The <em>dimensional analysis</em> helps you by focusing your attention into the units: you must set up the equation starting with the available units and add the factors with the units such that the cancelation of numerators and denominators ends up with the desired units: grams of aluminium in this case.
In this case, you start with a mass of 2.56 grams per penny, which is 
, whose value is $200.00 and want to end with the grams of
Aluminium needed.
Then, you must use the mole ratios derived from the chemical equation in a way that the units lead from grams of copper to grams of aluminium.
The equation is:
From which, the mole ratio between copper and aluminium is:
You must also use the atomic masses of Cu and Al which are 63.5g/mol and 27g/mol respectively.
The equation is:
You can check that afeter multiplying all the factors, the most units will cancel and the final units will be grams of Al.
Answer:
D) 0 k.cal per 4 grams
Explanation:
Genarally, glucose can be classified into two enantiomers such as d-glucose and l-glucose. The d-glucose is the most common sugar that bodies of living organisms use as source of energy. However, l-glucose is an organic compound and it is one of the aldohexose monosaccharides. It is the l-isomer of glucose and commonly refer to as a low-calorie sweetener. The l-glucose is relatively indistinguishable in taste from d-glucose but cannot be used as a source of energy. Therefore, in the given problem:
if d-glucose has an estimated caloric value of 1 k.cal per 4 grams of carbohydrate, then the caloric value of l-glucose will be 0 k.cal per 4 grams.
Answer:
Radon gas.
Explanation:
It forms naturally from the decay (breaking down) of radioactive elements, such as uranium, which are found in different amounts in soil and rock throughout the world. Radon gas in the soil and rock can move into the air and into underground water and surface water.
<span>The noble gases are the six elements that make up Group 18 of theperiodic table: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). At one time, this family of elements was also known as the rare gases.</span>
