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3 years ago

What is the abbreviation for water?

Chemistry

2 answers:

DENIUS [597]3 years ago

5 0

Abbreviation is: H2O

bulgar [2K]3 years ago

5 0

The abbriveation of water is: H2O

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Determine the molality of a solution of benzene dissolved in toluene (methylbenzene) for which the mole fraction of benzene is 0

kogti [31]

Answer:

2.32 m

Explanation:

So, according to definition of mole fraction:

$Mole\ fraction\ of\ benzene=\frac {n_{benzene}}{n_{benzene}+n_{toluene}}$

Mole fraction = 0.176

Applying values as:

$0.176=\frac {n_{benzene}}{n_{benzene}+n_{toluene}}$

$0.176\times ({n_{benzene}+n_{toluene}})={n_{benzene}}$

So,

$0.176\times n_{toluene}}=0.824\times {n_{benzene}}$

${n_{benzene}}=\frac {0.176}{0.824}\times n_{toluene}}$

${n_{benzene}}=0.2136\times n_{toluene}}$

Also, Molar mass of toluene = 92.14 g/mol

Thus,

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

$Mass=92.14\times n_{toluene}}\ g$

Also, 1 g = 0.001 kg

So,

$Mass\ of\ toluene=0.09214\times n_{toluene}}\ kg$

Molality is defined as the moles of the solute present in 1 kg of the solvent.

It is represented by 'm'.

Thus,

$Molality\ (m)=\frac {0.2136\times n_{toluene}}{0.09214\times n_{toluene}}$

<u>Molality of benzene = 2.32 m</u>

3 0

3 years ago

Based on the name, which substance is a covalent compound?

jek_recluse [69]

Compounds that has two elements on the formula can be bonded by ionic or covalent bond. If the compound is a metal and a non-metal then it will be ionic bonding. However, when it involves two non-metals, then it will have covalent bonding.

3 0

3 years ago

Phosphorite is a mineral that contains plus other non-phosphorus-containing compounds. What is the maximum amount of that can be

8_murik_8 [283]

Phosphorus can be prepared from calcium phosphate by the following reaction:

$2Ca_3(PO_4)_2(s)+6SiO_2(s)+10C(s)\rightarrow 6CaSiO_3(s)+P_4(s)+ 10CO(g)$

Phosphorite is a mineral that contains $Ca_3(PO_4)_2$ plus other non-phosphorus-containing compounds. What is the maximum amount of $P_4$ that can be produced from 2.3 kg of phosphorite if the phorphorite sample is 75% $Ca_3(PO_4)_2$ by mass? Assume an excess of the other reactants.

Answer: Thus the maximum amount of $P_4$ that can be produced is 0.345 kg

Explanation:

Given mass of phosphorite $Ca_3(PO_4)_2$ = 2.3 kg

As given percentage of phosphorite $Ca_3(PO_4)_2$ is = $\frac{75}{100}\times 2.3kg=1.725kg=1725g$

$moles=\frac{\text {given mass}}{\text {Molar mass}}$

${\text {moles of}Ca_3(PO_4)_2=\frac{1725g}{310g/mol}=5.56moles$

$2Ca_3(PO_4)_2(s)+6SiO_2(s)+10C(s)\rightarrow 6CaSiO_3(s)+P_4(s)+ 10CO(g)$

According to stoichiometry:

2 moles of phosphorite gives = 1 mole of $P_4$

Thus 5.56 moles of phosphorite give= $\frac{1}{2}\times 5.56=2.78moles$ of $P_4$

Mass of $P_4=moles\times {\text {Molar mass}}=2.78mol\times 124g/mol=345g=0.345kg$

Thus the maximum amount of $P_4$ that can be produced is 0.345 kg

5 0

3 years ago

Joanne wants to study the chemical properties of a substance. Which of the following is an example of a chemical property?

Eddi Din [679]

Answer:

observe if it reacts with acids

Explanation:

Because whether it reacts is determined by its chemical properties

4 0

3 years ago

Which class of organic compound is commonly used in fuels?

Advocard [28]

Among the choices, the best answer is alcohol. However, the most common groups of organic compounds in fuels are the alkanes and alkenes. Alcohol can also be used in fuel, especially bioethanol. Bioethanol is a common additive in fuels for motor vehicles, and is made from corn or sugar.

3 0

3 years ago

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