Answer:
there are some materials listed so next to it it shows that which material is pure substance and which material is mixture
and then the next shows which is a homologous and homogeneous compound or element
13. ribosomes
14. all organisms (I'm pretty sure)
Answer:
See explanation
Explanation:
A drying tube prevents moisture from contaminating the reactants. The drying tube contains CaCl2 a hygroscopic material whose function is to absorb the moisture so that it does not react with the Grignard reagent. Without the desiccating action of CaCl2, moisture will enter the reaction chamber,contaminating the reactants.
If water reacts with the Grignard reagent, an alkane is formed. The mechanism of this reaction is shown in the image attached. R here represents the alkyl moiety of the Grignard reagent.
Answer: -
Mass of Hydrated KAl(SO₄)₂ = 2.0 g
Molar mass of anhydrous KAl(SO₄)₂ = 258.20 g/ mol
Mass of of anhydrous KAl(SO₄)₂ = mass of the 2nd heating = A
The mass of water released = mass of the Aluminum Cup + 2.0 grams of KAl(SO₄)₂ - mass of the 2nd heating
= H g
Moles of water released = ![\frac{H g}{18 g/mol}](https://tex.z-dn.net/?f=%20%5Cfrac%7BH%20g%7D%7B18%20g%2Fmol%7D%20%20)
Moles of anhydrous KAl(SO₄)₂ = ![\frac{A g}{258.20 g/mol}](https://tex.z-dn.net/?f=%20%5Cfrac%7BA%20g%7D%7B258.20%20g%2Fmol%7D%20%20)
Required ratio = ![\frac{moles of water}{moles of anhydrous KAl(SO4)2}](https://tex.z-dn.net/?f=%20%5Cfrac%7Bmoles%20of%20water%7D%7Bmoles%20of%20anhydrous%20KAl%28SO4%292%7D%20%20)