For step 5: measure the mass of the water ( iron ) #1 : tare the balance : is 12.42g and #2 : use a graduated cylinder : is 52.66g and #3 : subtract to find the mass of water is : 40.24g THiS is All for (iron ) I hope this help i got them all wrong for u guys to get the answer

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

The molality of calcium chloride (cacl2) in an aqueous solution is 2.46 m. what is mole fraction of the solute?

Draw the aromatic compound toluene (methylbenzene). show all hydrogen atoms, including those on the ring.