An element with a mass of 680 grams decays by 27.7% per minute. To the nearest minute, how long will it be until there are 2 grams of the element remaining?

3 minute 35.969420299997999 seconds

Step-by-step explanation:

Okay in simple words its 3 minute and 35 seconds or something.

Since we want to leave 2 grams,

Amount to decay = 680-2

= 678g

Amount decayed per minute = 27.7 %

Amount decayed per minute (in grams) = 188.36 g

Amount decayed per second (in gram) = 3.139333333g

Your required Ans = 678 / 3.139333333

= 215.9694203 seconds

i have converted them to minute in the title : D