Question

1. How many aluminium atoms are in an aluminium can with mass 162g? (RMM AI 26.98g, 1 mole = 6.022 x 1023 atoms)

Answer 1

Given mass of aluminium can = 162g (m. Molas mass of AL: 26.98 g/mol (M) 1 mol = 6.022 x 1023 atoms moles of aluminium can = mass of aluminium can (0) Molar mass of Al m 1678 26.98g|mel 6.00 mob 1 mol of aluminium can contains=61022x10 atoms 6.00 mol of aluminium can contains of Al 6x 6.022x103 atoms of Al = 36.16 8 10 23 atoms of Al = 3.616 x 1024 atoms of Al Hence, 3.616x1024 ators of aluminium are in aluminium can with mass of 162g. Molarity of HC NaOH + HCl - Mall & HgO Given Molarity of NooH = 0.125 M 0.175M Volume of He used = 0.225 L Moles of Hc wed. Molarity of Hax Volume nha 0.175M X 0.2254 of Hel sol на = 0.039375 mol To completely neutralize nhel, we need moles of Naot = Noot = nha 0.039.975 mol Volgen Motorty of thote Hence, 0.3159 (0.25Noor 0-125M 0.039375 mol Kepuired to Volume old Nadh neutralle, Iblame of Naot used u Saudian 0-125M moles of Nach Volume of NadlH(L) 0.035275 male 0.315 L