Question

atomic weight of silicon is 28.0855 u. round this off to 4 significant figures​

Answer 1

Answer:

For molar mass try to use as many decimal places as possible to be the most accurate. The number of sig figs in your final answer will still be the same as the initial amount of sig figs in the mass given (or whatever value given that has the least amount of sig figs

Answer 2

Answer:

The correct answer is 28.086

Explanation

• To round up to 4 significant figures then we look at the 5 positions in the number provided.
• If in 5th place, if the number is 5 or greater than 5 then we round up the number otherwise we round down the number.
• Here at the 5th position is the number 5 is equal to 5 hence we round up the number to 28.086