không làm mà đòi có ăn thì ăn chubin nhé

3.1:

Ô tô đi hết 1h50'+40'=2h30'

3.2:

Ô tô đi hết:

17h50'-15h15'

=2h35'

Bài 1: 

b: Xét ΔOAC và ΔOBD có

OA=OB

\(\widehat{AOC}=\widehat{BOD}\)

OC=OD

Do đó: ΔOAC=ΔOBD

nhìn cái này, chắc mình phải đeo kính cận mất

nhìn khó quá

\(n_{CO_2}=\dfrac{0,448}{22,4}=0,02mol\)

\(CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2\uparrow\)

 0,02                                                   0,02

\(m_{CaCO_3}=0,02\cdot100=2\left(g\right)\)

\(\%m_{CaCO_3}=\dfrac{2}{5}\cdot100\%=40\%\)

\(\%m_{CaSO_4}=100\%-40\%=60\%\)

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