Question

Calcule a massa molar das substâncias a átomos seguir.
a) Mg
b) Se
c) Gás carbônico, CO2
d) Ácido clorídrico, HCl
e) Glicose, C6H12O6
f) Ácido nítrico HNO3
g) Ácido fosfórico H3PO4
h) Ácido carbônico H2CO3

Answer 1

$\small\boxed{\begin{array}{l}\tt a)~\sf Mg=24 \,g/mol\\\tt b)~\sf Se=79\,g/mol\\\tt c)~\sf CO_2=12+16\cdot2=12+32=44\,g/mol\\\tt d)~\sf HCl=1+35,5=36,5\,g/mol\\\tt e)~\sf C_6H_{12}O_6=6\cdot12+12\cdot1+6\cdot16=72+12+96=180\,g/mol\\\tt f)~\sf HNO_3=1+14+3\cdot16=15+48=63\,g/mol\\\tt g)~\sf H_3PO_4=3\cdot1+32+4\cdot16=3+32+64=99\,g/mol\\\tt h)~\sf H_2CO_3=2\cdot1+12+3\cdot16=2+12+48=62\,g/mol\end{array}}$