a)

PTPU là

2KCLO3(0,1) \(\rightarrow\) 2KCL(0,1) + 3O2(0,15)

b) theo đề bài ta có :

n_KCLO3 = 12,25 : (39+35,5+48) = 0,1 (mol)

Ta có :

n_O2 = \(\dfrac{3}{2}\) n_KCLO3 = 0,15(mol)

=> V_O2 = 0,15 . 22,4 = 3,36 (l)

c) Ta có :

PTHH:

O2(O,15) + 2Na(0,3) \(\rightarrow\) 2NaO(0,3)

Ta có : n_O2 = 0,15 (mol)

=> n_NaO = 0,15 . 2 = 0,3 (mol)

=> m_NaO = 0,3 . 39 = 11,7(g)

a)

Ta có PTHH :

Fe(0,2) + H2SO4(0,2) \(\rightarrow\) H2(0,2) + F2SO4(0,2)

Theo đề bài ta có :

n_Fe = 11,2 : 56 = 0,2 (mol )

=> n_H2 = n_Fe = 0,2 (mol )

=> V_H2 = 0,2 . 22,4 = 4,48(lít)

b)

C%_H2SO4 = \(\dfrac{100.100}{11,2+100}=89,9\%\)

Choose one option A, B, C or D corresponding to the whose main stress is on the syllable in the position which is different Iron that of the others. Identify your choice by circling letter A, B, C or D on the answer sheet.

A. ambitious

B. dangerous

C. mysterious

D. expensive