Because they are different elements have different number of protons and neutrons........ I guessed do not trust me...
Answer:
Molar mass of vitamin K = 450.56\frac{g}{mol}[/tex]
Explanation:
The freezing point of camphor = 178.4 ⁰C
the Kf of camphor = 37.7°C/m
where : m = molality
the relation between freezing point depression and molality is
Depression in freezing point = Kf X molality
Where
Kf = cryoscopic constant of camphor
molality = moles of solute dissolved per kg of solvent.
putting values
2.69°C = 37.7°C/m X molality
molality = 0.0714 mol /kg
![molality=\frac{molesofvitaminK}{massofcamphor(kg)}=\frac{moles}{0.025}](https://tex.z-dn.net/?f=molality%3D%5Cfrac%7BmolesofvitaminK%7D%7Bmassofcamphor%28kg%29%7D%3D%5Cfrac%7Bmoles%7D%7B0.025%7D)
moles of vitamin K = 0.0714X0.025 = 0.00178 mol
we know that moles are related to mass and molar mass of a substance as:
![moles=\frac{mass}{molarmass}](https://tex.z-dn.net/?f=moles%3D%5Cfrac%7Bmass%7D%7Bmolarmass%7D)
For vitamin K the mass is given = 0.802 grams
therefore molar mass = ![\frac{mass}{moles}=\frac{0.802}{0.00178}=450.56\frac{g}{mol}](https://tex.z-dn.net/?f=%5Cfrac%7Bmass%7D%7Bmoles%7D%3D%5Cfrac%7B0.802%7D%7B0.00178%7D%3D450.56%5Cfrac%7Bg%7D%7Bmol%7D)
Answer:it reacts chemically to produce heat and gas with rapid expansion of matter. It is a rapid chemical reaction
Explanation:
Answer:
Scientists attribute the global warming trend observed since the mid-20th century to the human expansion of the "greenhouse effect" — warming that results when the atmosphere traps heat radiating from Earth toward space.
Certain gases in the atmosphere block heat from escaping. Long-lived gases that remain semi-permanently in the atmosphere and do not respond physically or chemically to changes in temperature are described as "forcing" climate change. Gases, such as water vapor, which respond physically or chemically to changes in temperature are seen as "feedbacks."
Explanation:
The Lewis structure for H₂CO is shown in the attached picture. The central atom is the carbon. However, I'm not sure which bond you're referring to. There can be two answers. The two C-H bonds are sp³ hybridized because it is a single bond. The C=O bond is sp² hybridized because it is a double bond.