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3 years ago

Pleaze help im gonna fail this semester

2 answers:

7 0

when hydrogen peroxide mixed with vinegar makes peracetic which is potentially toxic and irritate skin, eyes and respiratory system.

alexandr1967 [171]3 years ago

3 0

Hydrogen peroxide mixed with vinegar makes peracetic acid, which is a toxic gas that irritates the skin and respiratory system

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How many years have the earth

Ivenika [448]

We need more information to answer this.

6 0

3 years ago

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What do the edifices from the hot water vent look like and what they are made of?

netineya [11]

Answer:

Water heaters must have vent to the outside of the heater to remove exhaust air from the water heater, the vent go directly through it walls. It is likened to the vent in natural gas water heater which have a vent to the outside that remove by products of combustion and can also bring in air combustion.

The edifice from the hot water vent are made of metals or plastic materials depending on the venting systems.

3 0

4 years ago

Two linear hydrocarbons, Hexane (C6H14) and Heptane (C7H16), form pretty much an ideal solution at any composition. A solution i

Anettt [7]

Answer:

$y_{C_6H_{14}}=0.92$

Explanation:

Hello,

At first, we compute liquid-phase molar fractions:

$n_{C_6H_{14}}=463.96 g*\frac{1mol}{86g} =5.3949molC_6H_{14}\\n_{C_7H_{16}}=667.71 g*\frac{1mol}{100g} =6.6771molC_7H_{16}\\x_{C_6H_{14}}=\frac{5.3949}{5.3949+6.6771} =0.447\\x_{C_7H_{16}}=1-x_{C_6H_{14}}=0.553$

Now, by means of the fugacity concept, for hexane, for instance, we have:

$f_{C_6H_{14}}^V=f_{C_6H_{14}}^L\\y_{C_6H_{14}}p_T=x_{C_6H_{14}}p_{C_6H_{14}}$

In this manner, at 25 °C the vapor pressure of hexane and heptane are 0.198946 atm and 0.013912 atm repectively, thus, the total pressure is:

$p_T=x_{C_6H_{14}}p_{C_6H_{14}}+x_{C_7H_{16}}p_{C_7H_{16}}\\p_T=0.447*0.198946 atm +0.553*0.013912 atm=0.096622atm$

Finally, from the hexane's fugacity equation, we find its mole fraction in the vapour as:

$y_{C_6H_{14}}=\frac{x_{C_6H_{14}}p_{C_6H_{14}}}{p_T}=\frac{0.447*0.198946 atm}{0.096622atm} \\y_{C_6H_{14}}=0.92$

Best regards.

3 0

3 years ago

Read 2 more answers

A student creates a solution by dissolving some Na2SO4 (molar mass = 142.05 g/mol) in enough water to create 0.500 L of solution

NeX [460]

Answer : The mass of $Na_2SO_4$ is, 4.43 grams.

Explanation :

As we know that, when $Na_2SO_4$ dissolve in water then it dissociates to give 2 mole of sodium ion $Na^+$ and 1 mole of sulfate ion $SO_4^{2-}$

The chemical reaction will be:

$Na_2SO_4\rightarrow 2Na^++SO_4^{2-}$

Thus, the concentration of $Na_2SO_4$ = $\frac{\text{Concentration of }Na^+}{2}=\frac{0.125M}{2}=0.0625M$

First we have to calculate the moles of $Na_2SO_4$

$\text{Concentration of }Na_2SO_4=\frac{\text{Moles of }Na_2SO_4}{\text{Volume of solution}}$

$0.0625M=\frac{\text{Moles of }Na_2SO_4}{0.500L}$

$\text{Moles of }Na_2SO_4=0.0312mol$

Now we have to calculate the mass of $Na_2SO_4$

$\text{Mass of }Na_2SO_4=\text{Moles of }Na_2SO_4\times \text{Molar mass of }Na_2SO_4$

Molar mass of $Na_2SO_4$ = 142 g/mol

$\text{Mass of }Na_2SO_4=0.0312mol\times 142g/mol=4.43g$

Thus, the mass of $Na_2SO_4$ is, 4.43 grams.

6 0

3 years ago

Which best describes how the sun rotates?

son4ous [18]

D.The sun does not rotate

7 0

4 years ago