He can repeat his experiment multiple times, and ask a friend to repeat it as well to see if they get the same answer.
Answer: Pt(Cl)2(NH3)2
Explanation:
In the formation of the complex, the oxidation number of platinum is plus two (+2) and two chloride ions cancel it out by their oxidation number of -1 each. Hence the complex has an overall charge of zero. It is thus neutral with no charge attached to its formula.
The weight is influenced by the density and the volume. In this case, you are given the density of gasoline(0.65g/ml) and the volume (31l or 8 gallons). Since the unit is different, that mean you need to convert it. It will be easier to convert liter into ml than gallon so we will use 31L as volume. The calculation would be:
mass=density * volume= 0.65g/ml * 31l * (1000ml/l) * (1kg/1000gram)= 20.15kg
Given what we know, we can confirm that the interest rate necessary to reach $5500 in 7 years with a starting investment of $4000 on a yearly compounded interest, would be 4.7%.
<h3>Why is this the required interest rate?</h3>
Since the question did not specify any extra data to be taken into account, such as:
- Interest variance
- Monthly or yearly contributions
- Inflation rates
and so on, we can assume that all of these values are null. Therefore, if we take $4000 and add 4.7%, and repeat that every time using our new totals, after 7 repetitions we are left with close to $5500, which is our goal.
Therefore, we can confirm that the interest rate necessary to reach $5500 in 7 years with a starting investment of $4000 on a yearly compounded interest, would be 4.7%.
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