CHEMISTRY HIGH SCHOOL

Calculate the molecular weight of a dibasic acid.0.56gm of which is required 250ml of N/20 sodium hydroxide solution for neutralization.​

Answers

Answer 1
Answer:

Answer: The molecular weight of the dibasic acid is 89.6 g/mol

Explanation:

Normality is defined as the amount of solute expressed in the number of gram equivalents present per liter of solution. The units of normality are eq/L. The formula used to calculate normality:

\text{Normality}=\frac{\text{Given mass of solute}* 1000}{\text{Equivalent mass of solute}* \text{Volume of solution (mL)}}      ....(1)

We are given:

Normality of solution = (1)/(20)=0.05N

Given mass of solute = 0.56 g

Volume of solution = 250 mL

Putting values in equation 1, we get:

0.05=\frac{0.56* 1000}{\text{Equivalent mass of solute}* 250}\n\n\text{Equivalent mass of solute}=(0.56* 1000)/(0.05* 250)=44.8g/eq

Equivalent weight of an acid is calculated by using the equation:

\text{Equivalent weight}=\frac{\text{Molar mass}}{\text{Basicity}}   .....(2)

Equivalent weight of acid = 44.8 g/eq

Basicity of an acid = 2 eq/mol

Putting values in equation 2, we get:

44.8g/eq=\frac{\text{Molar mass}}{2eq/mol}\n\n\text{Molar mass}=(44.8g/eq* 2eq/mol)=89.6g/mol

Hence, the molecular weight of the dibasic acid is 89.6 g/mol

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d. CH₃CH₂CH₂COOH 
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Answers

answer D, because it's acid

How do plants store glucose?

Answers

The model of photosynthesis used by biologists begins when chlorophyll splits a water molecule into hydrogen and oxygen. The oxygen from the water is a waste product that is released as a gas. In later stages of photosynthesis, carbon dioxide from the air and hydrogen from the water unite to form glucose. Photosynthesis usually takes place in the leaves of green plants. The food produced is a simple sugar called glucose. Some of the food made during  photosynthesis is used by plants for their growth and development. The rest is stored in the plant.

C12H22O11 + 11 H2SO4 → 12 C + 11 H2SO4 + 11 H2OIs the concentrated H2SO4, a catalyst in this reaction?

Answers

Answer : Yes, the concentrated H_2SO_4 is a catalyst in this reaction.

Explanation :

Catalyst : It is a substance that increase the rate of chemical reaction but it is not consumed by the reaction. That means catalyst can be recovered chemically at the end of the reaction.

The given balanced chemical reaction is,

C_(12)H_(22)O_(11)+11H_2SO_4\rightarrow 12C+11H_2SO_4+11H_2O

From the balanced chemical reaction we conclude that the amount of H_2SO_4 present in the reactant side are remains same as the amount of H_2SO_4 present in the product side. That means the amount of H_2SO_4 is not consumed by the reaction and it can be recovered chemically at the end of the reaction.

Hence, yes, concentrated H_2SO_4 is a catalyst in this reaction.

Answer:

Explanation:

a that the ansawer

A student wants to prepare a 1.0-liter solution of a specific Molarity. The student determines that the mass of the solute needs to be 30. grams. What is the proper procedure to follow?(1) Add 30. g of solute to 1.0 L of solvent.
(2) Add 30. g of solute to 970. mL of solvent to make 1.0 L of solution.
(3) Add 1000. g of solvent to 30. g of solute.
(4) Add enough solvent to 30. g of solute to make 1.0 L of solution.

Answers

A student wants to prepare a 1.0-liter solution of a specific Molarity. The student determines that the mass of the solute needs to be 30. grams. Add enough solvent to 30. g of solute to make 1.0 L of solution.

What is molarity ?

The proportion of solute moles to solution length is known as molarity. By dividing the number of moles of HCl by the volume (L) of the solution in which it was dissolved, we may get the acid solution's molarity.

A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration.

A mole is a unit of measurement for a chemical substance, and it is from this unit that the word "molarity" is derived. The method of figuring out how much of a material a certain chemical solution contains is known as molecularity, sometimes known as the molar concentration of a solution.

Thus, option 4 is correct.

To learn more about molarity, follow the link;

brainly.com/question/8732513

#SPJ2
The answer is (4) Add enough solvent to 30.0 g of solute to make 1.0 L solution. The molarity is calculated using volume of the solution. When solute dissolving, the total volume will change. So the final volume of solution need to be 1.0 L.

What is a limiting reagent?

Answers

The reactant that is used up first in a reaction.
It is the substance that is totally consumed when the chemical reaction is complete....

**98 POINTS** Given 1.00 gram of (NH4)2 CO3, how many grams of this sample would be due to hydrogen?

Answers

OP already did it - CONGRATS!!

here are the steps 2 get the same ans:

(NH4)2 CO3 has 2x N, 8x H, 1x C and 3x O per molecule

so its molecular mass = 2x14 + 8x1 + 1x12 + 3x16

=28+8+12+48

=96g

of that 96g, 8x1=8g is due to Hydrogen

so by ratio n proportion, 1.00g will have 1x8/96 = 1/12g = 0.083g of H
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