5.5x10² – 6.50x10' Express the calculation in correct significant digits
1 answer:
Answer:
Explanation:
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In this case, when performing mathematical operations with numbers in scientific notation, the first step is to write them in standard notation:
550 - 65.0
Thus, the result without any significant figures-based analysis is:
615.0
However, since 550 is significant to the ones and 65.0 to the tenths, we need to round the result to the bigger significance, in this case to the ones; therefore the appropriate result would be:
615
That in scientific notation would be:
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<u>Answer:</u> The amount of kilocalories contained in the given serving of crackes is 0.120 kCal
<u>Explanation:</u>
<u>As per the USDA:</u>
Carbohydrates provide 4 calories per gram, protein provides 4 calories per gram, and fat provides 9 calories per gram
We are given:
Mass of fat in the crackers = 4 g
Mass of carbohydrates in the crackers = 19 g
Mass of protein in the crackers = 2 g
Conversion factor used: 1 kCal = 1000 Cal
Applying unitary method:
- <u>For Fat:</u>
1 gram of fat provides 9 calories
So, 4 gram of fat will provide =
- <u>For Carbohydrates:</u>
1 gram of carbohydrates provides 4 calories
So, 19 gram of carbohydrates will provide =
- <u>For Proteins:</u>
1 gram of proteins provides 4 calories
So, 2 gram of fat will provide =
Total kilocalories per serving = [0.036 + 0.076 + 0.008] kCal = 0.120 kCal
Hence, the amount of kilocalories contained in the given serving of crackes is 0.120 kCal