Answer:
0.020g/lb
Explanation:
We start off with 45 mg/kg.
Let's convert the mg to g first to get half the units correct.
1g = 1000mg
Therefore 45mg = 0.045g.
Now we're at 0.045g/kg.
Next we need to convert the kg to lbs.
1 kg = 2.20462262 lbs.
therefore we need to divide 0.045 by 2.20462... to get g/lbs
This gives 0.02041165667 g/lb.
We need this to 2SF, so round to 0.020g/lb
Ok so, P1V1 = P2V2 this is.. (1atm)(50 ml) = (x atm)(120 ml)
Algebraically the answer should be 0.416 atm. which does make sense b/c in volume is increasing, vapor pressure is lowering.
Answer:
here's the answer to your question about
Answer:
<em><u>Metal oxides</u></em>
Explanation:
Al2O3, ZnO and SnO are typical amphoteric oxides. Metal oxides are usually basic and they react with acids to form their respective salts
Answer:
237.9 amu
Explanation:
Given data:
Abundance of U-234 = 0.0054 %
Abundance of U-235 = 0.7204%
Abundance of U-238 = 99.2742%
Average atomic mass = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass / 100
Average atomic mass = (0.0054×234)+(0.7204×235) +(99.2742×238) /100
Average atomic mass = 1.2636+ 169.294+ 23627.2596 / 100
Average atomic mass = 23797.8172/ 100
Average atomic mass = 237.9 amu.
