PTHH: \(CH_4+2O_2\rightarrow^{t^o}CO_2+2H_2O\)

\(2C_4H_{10}+13O_2\rightarrow^{t^o}8CO_2+10H_2O\)

Đặt \(\hept{\begin{cases}x\left(mol\right)=CH_4\\y\left(mol\right)=C_4H_{10}\end{cases}}\), có hệ phương trình sau

\(\hept{\begin{cases}16x+58y=7,4\\44x+176y=22\end{cases}}\)

\(\Leftrightarrow x=y=0,1\)

Dưa vào PTHH 1: \(n_{O_2}=2x=0,1.2=0,2mol\)

Dựa vào PTHH 2: \(n_{O_2}=\frac{13.0,1}{2}=0,65mol\)

Có tổng số mol của \(O_2\) là: \(0,2+0,65=0,85mol\)

\(\rightarrow m_{O_2}=32.0,85=27,2g\)

ok bn nha

D chắc thế thôi nha sai 70 % lun đó 

D. Clothes

@Cỏ

C.thought

My father first ……………… Da Lat in 2010.

A. visited                                  B. went                        C. go                          D. been

k em nha cj

Tui nghĩ là B. went

     HT

         Ocean water is too salty drink. It is also too salty for watering plants. We must have the ways to make fresh water from salty water. We should be careful not to waste water

         Ocean water is too salty (drink/drinking/ to drink/ to drinking). It is also too salty for watering plants. We must have the ways to make fresh water from salty water. We should be (careful/ careless/ carefully/ carelessly) not to waste water.

Hc tốt

1.on

2.to drink

3.careful

Hóa học đâu có ở lớp 6 đâu bạn mà đây cũng đâu phải là môn Hóa

Ai đề môn Hoá đâu bn, bn sao v

We can reuse ……………..

     A. water                       B. air                            C. bottles

Trả lời:

C. bottles

HT

1/.Give the correct form of the word to complete the sentences:

1, She locked the door so as ........... not to be disturbed....................... .                  NOT DISTURB

2, We receive a lot of ........encouragement........................from our teacher.      ENCOURAGE

3, Many ...........cultural................... activities are held every year.         CULTURE

4, l'm .......amazing........................ that he won price                               AMAZE

2/ Chircle the underlined words or phrase (A, B, C or D) that are incorrect and correct them:

1, We have sung together ever when l was a small child. ->....................since.................

               A                                    B         C                  D                                            

2, My father's car is the same colour  my uncle's car. -> ........as.............................

                A                B                       C               D

3, Shall you close the window for me, please? -> .........Can..........

      A               B                       C              D

1) 1. not be disturbed 

2.encouragement

3. cultural

4.amazed

2) 1A --> when -> since

 2C --> --> as

3A ---> SHALL --> WILL