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3 years ago

Calculate the mass of solute in 500cm³ of 1.5mol/dm³ sodium hydroxide solution

1 answer:

8 0

Answer: The general formulae for moles is n=m/mr so now we have being given to find the mass so all we have to do is to change subject

Explanation: so we have to change subject in this question to m= n× mr . so in the question below we have being given the mole as 1.5mol/dm³ so all we have to do is to find the molecular relative mass(mr) .

to find the molecular relative mass of sodium hydroxide (NAOH) we add all of the atomic masses of all the atoms present so here we have sodium oxygen and hydrogen atoms present.

NA=23 O=16 H=1 so we add 23+16+1=40 so 40 is our molecular relative mass

now we fix it in our formulae which is m=n× mr

m=1.5× 40 =60 so our mass is 60grams or 60g

HOPE THIS HELPS!!!! if i made a mistake our MAY answer may be wrong feel free to comment

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Draw the mechanism for the addition of methylmagnesium bromide to propanoyl chloride (CH3CH2COCl) to give 2-methyl-2-butanol.

Ghella [55]

Answer:

Reaction mechanism has been given below

Explanation:

Propanoyl chloride contains an electrophilic carbonyl center to give nucleophilic acyl substitution reaction by removing Cl group with a strong nucleophile like methylmagnesium bromide.
Two equivalent of methyl magnesium bromide react with cabonyl center followed by protonation of negatively charged oxygen atom gives 2-methyl-2-butanol.
In the first step, nucleophilic acyl substituion occurs. In the second step, nucleophilic addition occurs. In the third step, protonation occurs.
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3 years ago

A student measures the mass of an 8 cm block of brown sugar to be 12.9 g. What is the density of

horrorfan [7]

Answer:

0.0025g/cm³

Explanation:

Given parameters:

Mass of the brown sugar = 12.9g

dimension of the sugar = 8cm

unknown:

density of the sugar = ?

Solution

Density is defined as the mass per unit volume of a substance. The expression is given below:

Density = $\frac{mass}{volume}$

We know the mass of the substance but the volume is unknown:

Volume of the brown sugar = l x bx h = 8x8x8 = 512cm³

Density of the brown sugar = $\frac{12.9}{512}$ = 0.0025g/cm³

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3 years ago

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Explanation:

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3 years ago

Aspirin (C9H8O4) is synthesized by reacting salicylic acid (C7H6O3) with acetic anhydride (C4H6O3) according to the reaction: C7

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Answer:

$7.39\times 10^{3}g$ of acetic anhydride is needed

Explanation:

According to balanced equation, 1 mol of salicylic acid completely reacts with 1 mol of acetic anhydride

Number of moles = (mass)/(molar mass)

Molar mass of acetic anhydride = 102.09 g/mol

Molar mass of salicylic acid = 138.121 g/mol

So, $1.00\times 10^{4}g$ of salicylic acid = $\frac{1.00\times 10^{4}}{138.121}moles$ of salicylic acid

Hence, $\frac{1.00\times 10^{4}}{138.121}moles$ of salicylic acid reacts completely with $\frac{1.00\times 10^{4}}{138.121}moles$ of acetic anhydride.

So, mass of acetic anhydride needed = $\frac{1.00\times 10^{4}}{138.121}\times 102.09g$ = $7.39\times 10^{3}g$

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3 years ago

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4 years ago

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Calculate the mass of solute in 500cm³ of 1.5mol/dm³ sodium hydroxide solution​

Calculate the mass of solute in 500cm³ of 1.5mol/dm³ sodium hydroxide solution