All questions can be solved by C1V1=C2V2
1) 5.00M x V1 = 0.900M x 500.0 mL
V1= 90 ml
therefor you need to add 500 - 90 = 410.0 ml
2) 20.0 mL x C1 = 150.0mL x 1.50 M
C1= 11.25 M
3) 12.00 mL x 3.50 M = 100.0 mL x C2
C2= 0.42 M
4) 9.0 mL x 8.0 M = 0.50 M x V2
V2 = 144 ml
Answer:
1.385 x 1025 molecules are there in 23 mole of oxygen
Answer:
Total percent of magnesium in sample = 25.5%
Explanation:
Given:
Mass of magnesium = 24 gram
Mass of chlorine = 70 gram
Find:
Total percent of magnesium in sample = ?
Computation:
Total mass of sample = Mass of magnesium + Mass of chlorine
Total mass of sample = 24 gram + 70 gram
Total mass of sample = 94 gram
Total percent of magnesium in sample = [Mass of magnesium / Total mass of sample]100
Total percent of magnesium in sample = [24/94]100
Total percent of magnesium in sample = [0.255]100
Total percent of magnesium in sample = 25.5%
Reflection. The sound waves bounced off of the walls and it came back to you.