Final answer:
Without the percentage of sugar in the bar, we assume the sugar is proportional to the mass. Reducing the bar from 11.630 g to 4.000 g means the sugar would also reduce to 4.000 g or 4000 mg. To convert grams to milligrams, multiply by 1000.
Step-by-step explanation:
To determine the amount of sugar in milligrams when the size of a milk chocolate bar is reduced from 11.630 g to 4.000 g, we need to know the percentage of sugar in the original bar. However, without that information, we can discuss how to convert the grams to milligrams. To convert grams to milligrams, you multiply by 1000, because there are 1000 milligrams in a gram.
If we assume the sugar content is directly proportional to the mass of the chocolate bar, and if the entire bar was sugar, then reducing the bar from 11.630 g to 4.000 g corresponds to a reduction in sugar amount by the same proportion. If the sugar was 11.630 g (or 11630 mg) before, after the reduction it would be 4.000 g (or 4000 mg) assuming the entire bar is made of sugar.
Therefore, 4.000 g of sugar would be equivalent to 4000 mg to four significant figures. Again, this is a straightforward unit conversion where we only need simple multiplication.