Question

Answer 1

Cho m₂ = 2l

Ta có phương trình cân bằng nhiệt 

\(Q_{toả}=Q_{thu}\\ \Leftrightarrow m_3c_{Al}\left(t_2-t_{cb}\right)=\left(m_1c_{Cu}+m_2c_{H_2O}\right)\left(t_{cb}-t_1\right)\\\Leftrightarrow 0,5.880\left(100-t_{cb}\right)=\left(0,3.380+2.4200\right)\left(t_{cb}-30\right)\\ \Leftrightarrow44000-440t_{cb}=8664t_{cb}-259920\\ \Leftrightarrow303920=9124t_{cb}\\ \Rightarrow t_{cb}=33,3^o\)