(a) 455 cal to joules
thats 1 903.72 joules
but i need to round it to 3 sig figs how do u do that?
To round a number to three significant figures, you need to identify the digit at the third significant figure and determine if rounding up or down is necessary based on the following digit.
In the given conversion, 1 903.72 joules has six significant figures. To round it to three significant figures:
Step 1: Locate the third significant figure, which is 9 (1,903.72).
Step 2: Look at the digit immediately to the right, which is 7.
Step 3: If the following digit is greater than or equal to 5, round the third significant figure up (increase the value by 1). Otherwise, leave the third significant figure unchanged.
Step 4: Eliminate all digits to the right of the third significant figure.
In this case, since the digit after the third significant figure (9) is 7 (greater than 5), rounding up is required. Therefore, rounding 1,903.72 joules to three significant figures would yield:
1,904 joules
So, the rounded result is 1,904 joules.