năng lượng hoạt hóa của một phản ứng khi không có chất xúc tác bằng 75,24kj/mol, cofn khi có chất xúc tác bằng 45,36kj/mol. Tính khi có mặt chất xúc tác thì ti\ốc đôh phản ứng tăng bao nhiêu lần nếu ở 20 độ

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally