a)\(n_P=\dfrac{0,93}{31}=0,03\left(m\right)\)
\(n_{O_2}=\dfrac{3,36}{32}=0,15\left(m\right)\)
\(PTHH:4P+5O_2->2P_2O_5\)
theo phương trình ta có:\(\dfrac{0,3}{4}>\dfrac{0,15}{3}\)->P dư
\(n_{P\left(dư\right)}=0,3-0,12=0,18\left(m\right)\)
\(m_{P\left(dư\right)}=0,18.31=5,58\left(g\right)\)
b)\(m_{P_2O_5}=0,12.142=17,04\left(g\right)\)