The formula of gypsum and that of plaster of parls are CaSO4.xH2O and CaSO4.yH2O respectively.

Chemistry

1 answer:

barxatty [35]3 years ago

3 0

Answer:

$\frac{3}{2}$

Explanation:

Given formula of Gypsum:

CaSO₄. xH₂O,

True formula:

CaSO₄. 2H₂O, x = 2

Formula of plaster of paris = CaSO₄. $\frac{1}{2}$ H₂O,

y = $\frac{1}{2}$

The difference between x and y; x - y:

x - y = 2 - $\frac{1}{2}$ = $\frac{3}{2}$

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Yeast converts glucose to ethanol and carbon dioxide during a process known as anaerobic fermentation. The chemical reaction is

Korolek [52]

Answer:

102g

Explanation:

To find the mass of ethanol formed, we first need to ensure that we have a balanced chemical equation. A balanced chemical equation is where the number of atoms of each element is the same on both sides of the equation (reactants and products). This is useful as only when a chemical equation is balanced, we can understand the relationship of the amount (moles) of reactant and products, or to put it simply, their relationship with one another.

In this case, the given equation is already balanced.

$\tex{C_6H_{12}O_6} \longrightarrow 2 \ C_2H_6O + 2 \ CO_2$

From the equation, the amount of ethanol produced is twice the amount of yeast present, or the same amount of carbon dioxide produced. Do note that amount refers to the number of moles here.

Mole= Mass ÷Mr

Mass= Mole ×Mr

Method 1: using the mass of glucose

Mr of glucose

= 6(12) +12(1) +6(16)

= 180

Moles of glucose reacted

= 200 ÷180

= $\frac{10}{9}$ mol