Answer:
Lavoisier reacted mercury with oxygen to form mercuric oxide
Answer:
The molar mass of the unknown substance is 255g/mole
Explanation:
Freezing point depression is given by
ΔT = i · Kf · m
Where
m = molality of the solute
i = van't Hoff's factor = i for non electrolyte
Kf = 20.4 °C/m = cryoscopic constant
ΔT = Freezing point depression
Therefore ΔT = 6.6 - 5 = 1.6 °C
1.6 °C = 20.4 °C/m × 1 × m
Therefore m = 1.6/20.4 = 0.0784 m
number of moles in 2.50 g of cyclohexane = 0.0784 m or 0.0784 moles of the substance in 1000 grams of cyclohexane. That is
2.5 ×0.0784/1000 moles in 2.5 graams of cyclohexane that is
1.96 × 10⁻⁵ moles in 2.5 grams of cyclohexane
1.96 × 10⁻⁵ moles of the substance weighs 0.050 grams
Therefore 1 Mole weighs (0.05 g)/(1.96 × 10⁻⁵ moles) = 255g/mole
Hello.
Alkali metals are the most reactive group in the periodic table, not to be confused with Alkaline earth metals.
Also, Methane is a gas, not a group on the periodic table.
they contain triple bond, one sigma bond and 2 pi bonds. Pi bonds are weak and easily broken making the compound active.
<span>Chemical reaction is the process of breaking down bonds in reactants and forming new bonds in products. </span>
<span>In Alkynes breaking down bonds is easier so they are more active.
Have a nice day
</span>
True, All non- zero digits are considered Significant.
