1. How many molecules of barium hydroxide, Ba(OH)2 are there in 21.9 grams of barium hydroxide?

Explanation:

1) I have an exam in spanish class

2)You have a project in English class

3) He has a report in science class

4) She has homework in her favorite class

1) I dont have an exam in spanish class

2) You dont have a project in english class

3) He does not have a report in science class

4) She does not have homework in her favorite class

1) At what time is your first lesson?

2) At what time is your second lesson?

3) At what time is your third lesson?

4)At what time is your forth lesson?

5) At what time is your fifth lesson?

6)At what time is your sixth lesson?

7)At what time is your seventh lesson?

8)At what time is your first lesson? At nine twenty-five

9) At what time is your second lesson? At ten-seventeen

10) At what time is your third lesson? At eleven o-nine

11) At what time is your forth lesson? At two o-eight

12)At what time is your fifth lesson? At one fifty-eight

13)At what time is your sixth lesson? At two forty

14)At what time is your seventh lesson? At three thirty-two

done, mark me as branliest pleaseee

answersilicon (si); oxygen (o);