Explanation: count from starting at the beginning of the number on the ruler "2" and counted up until the end of the blue object. Counted 7 lines, so, 2.7 is the correct answer.
1 gram of Al2(Co3)3 equals 0.0017112683785004 moles, we need the amount of moles produced in 300 grams of Al2(CO3)3, so we have to multiply 1 gram of Al2(CO3)3 times 300: 0.0017112683785004 x 300, in conclusion,
