What is an easy way to add chemical reactions like P4O10(s) + 6H2O(l) → 4H3PO4

If a plot weight (in g) vs. volume (in ml) for a metal gave the equation y= 13.41x and r^2=0.9981 what is the density of the metal?

50 pts plz what is the physical state of matter of baking soda.

If 3.00 g of titanium metal is reacted with 6.00 g of chlorine gas, cl2, to form 7.7 g of titanium (iv) chloride in a combination reaction, what is the percent yield of the product?