Answer:
Explanation:
A. 64 g O2(1 mole/32 g)(6.023x10^23molecules/mole)=12.04x10^23 =1.204x10^24
B. hydrogen 10 g/2 g/mol =(5 mol) 6.023 x 10^23
helium 10g/4g/mol=(2.5 mol)(6.023x10^23
C. 0.5molO2 x32 g/mol= 16g
D. (3.011 x10^23 atoms/6.023 x 10^23 atoms/mol)x (12g/mol)=6g
E. (58.5g/mol) x 10 mol= 585 g
A pure substance consists only of one element or one mixture
There is no physical change that can separate the compounds into more than one substance
This makes a compound a pure substance
The answer is A. For a first-order chemical reaction, the rate constant k has a relationship with concentration C as follow: dC/dT=k*C. So in this reaction, (1-0.5)/30=k*0.5. So k=0.033
Explanation:
There will be an increase in the inter-molecular forces of attraction when there is an increase with the size of molecules/atoms because there will be an increase in the number of individual electrons that each molecule /atom will possess, hence, increasing the dipole-dipole attraction between the molecules/atoms.