Apakah kepentingan jejak karbon (carbon footprint)? À mengukur kepentingan seorang manusia B mengenal pasti pembaziran / kecekapan dari segi penggunaan tenaga atau bahan mentah.
C mengurangkan kos pengeluaran ke atas barangan keperluan manusia seperti makanan, perumahan dan pengangkutan D menghitung jumlah tanah, makanan pengangkutan dan perumahan yang diperlukan untuk setiap orang

which one? A, B,C or D?​

15) a substance used in manufacturing gasoline consists of finely divided platinum supported on an inert solid. suppose that the platinum is formed by the high temperature reaction between platinum (iv) oxide and hydrogen gas. the other product is water. a) write and balance the equation b) how many grams of hydrogen are needed to produce 1.0 g of platinum metal? c) how many moles of water are produced at the same time? how many grams? ( show work, .)