solid sodium reacts violently with water producing heat, hydrogen gas and sodium hydroxide. How many molecules of hydrogen gas are produced when 65.4g of sodium are added to water? 2Na(s)+ 2H2O(l) -->. 2NaOH(aq) + H2(g). Can someone please explain this question and it's answer to me?

Answer 1

From the equation of the reaction,2 moles of sodium and water produced one mole of hydrogen gas.what you are asked to find is the moles of hydrogen.....d mole ratio of na and hydrogen is 2 and 1.so sodium all over hydrogen=2 all over 1(d mole ratio).recall,mole=mass÷molar mass....find d mole of sodium first using this formular above,and of hydrigen,but hydrogen dnt av mass (what we r looking for here is mass of hydrogen. Use the formula above to substitute yr moles of sodium and hydrogen (mass of hydrogen all over two).after getting the mass of hydrigen,use d normal formula....moles=mass/molar mass by substituting ur mass of hydrogen nd molarmass.your final answer will 1.422 moles or molecules of hydrigen.after u get d moles of hydrogen... Use d formula... Moles=no of atoms/avogadro constant.what u get is ur number of molecules(atoms=molecules).