number 6 
CO2
+
H₂O →
C6H12O6 +
O2
                                             
                                          
                                          
                                        
											 
											Explanation:
[tex]\pmb{\sf{\purple{ 6CO_{2}+6H_{2}O \longrightarrow C_{6}H_{12}O_{6}+6O_{2}}}}[/tex]