Question

By which integer should the number of moles of each element be multiplied in the unknown sample?

A. 1
B. 2
C. 3
D. 4
E. 5

Answer 1

To determine by which integer the number of moles of each element should be multiplied in the unknown sample, we need to find the ratio between the number of moles of each element. By dividing the number of moles of each element in the unknown sample by the smallest number of moles, we can determine the integer by which the number of moles needs to be multiplied to achieve a whole number ratio. The answer is 5.

Step-by-step explanation:

To determine by which integer the number of moles of each element should be multiplied in the unknown sample, we need to find the ratio between the number of moles of each element. This can be done using the given information. For example, if we have 1 mole of a substance, we can compare it to the number of moles of calcium (2 moles) and phosphorus (5 moles) in the complete table. By dividing the number of moles of each element in the unknown sample by the smallest number of moles, we can determine the integer by which the number of moles needs to be multiplied to achieve a whole number ratio.

1. 1 mole of a substance / 1 mole of calcium = 1
2. 1 mole of a substance / 2 moles of calcium = 0.5
3. 1 mole of a substance / 5 moles of phosphorus = 0.2

Based on these calculations, we can see that the smallest integer that will convert each of the moles into a whole number is 5. Therefore, the answer is E. 5.