Question

question 16 (5 points)
what is the answer, with the correct number of significant figures, for this problem?
4.392 g + 102.40 g + 2.51 g =
109.30 g
110 g
109.3 g
109 g
109.302 g
question 17 (5 points)
if the temperature is 20 °c, what is the corresponding temperature on the fahrenheit scale?
239 °f
68 °f
94 °f
-22 °f
43 °f

Explanation:

Step1: Add the masses

$4.392\ g+102.40\ g + 2.51\ g=109.302\ g$

Step2: Determine significant - figures for addition

For addition, we look at the decimal place. The number with the least number of decimal places among the values being added is $2.51$ (two decimal places). Rounding $109.302$ to two decimal places gives $109.30\ g$.

Step3: Convert Celsius to Fahrenheit

The formula for converting Celsius to Fahrenheit is $F=\frac{9}{5}C + 32$. Substitute $C = 20$ into the formula: $F=\frac{9}{5}\times20+32$.
First, calculate $\frac{9}{5}\times20=9\times4 = 36$. Then $F=36 + 32=68^{\circ}F$.

Answer:

Question 16: 109.30 g
Question 17: 68 °F