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3 years ago

Write structural formulas for each of the following compounds:

Chemistry

1 answer:

Rainbow [258]3 years ago

6 0

Explanation:

Structural formula is defined as the formula in which the bonding and type of bonds which holds the atoms in molecule together are shown.

For the given options:

Option a: Pyrogallol (1,2,3-benzenetriol)

The functional group attached is hydroxyl $(-OH)$ group. The structure is attached in the image below.

Option b: o-Benzylphenol

The substitutent attached to parent structture (phenol) is benzyl. The structure is attached in the image below.

Option c: 3-Nitro-1-naphtol

The functional group attached is nitro $(-NO_2)$ group at 3rd position. The structure is attached in the image below.

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The tablet has a mass of 1.20 g and contains 700 mg of lithium carbonate.

kondaur [170]

Answer:

The right answer is "58.3%".

Explanation:

The given values are:

Mass of lithium carbonate,

= 700 mg

i.e.,

= 0.7 g

Mass of tablet,

= 1.20 g

Now,

The percentage of active ingredient will be:

= $\frac{Mass \ of lithium \ carbonate}{Mass \ of \ tablet}\times 100$

On substituting the given values, we get

= $\frac{0.7}{1.20}\times 100$

= $0.583\times 100$

= $58.3$ %

4 0

3 years ago

A cylinder with a moveable piston contains 0.552 mol of gas and has a volume of 259 mL . Part A What will its volume be if an ad

Naddik [55]

Answer:

The new volume will be 367mL

Explanation:

Using PV = nRT

V1 = 259mL = 0.000259L

n1 = 0.552moles

At constant temperature and pressure, the value is

P * 0.000259 = 0.552 * RT ------equation 1

= 0.552 / 0.000259

= 2131.274

V2 = ?

n2 = 0.552 + 0.232

n2 = 0.784mole

Using ideal gas equation,

PV = nRT

P * V2 = 0.784 * RT ---------- equation 2

Combining equations 1 and 2 we have;

V2 = 0.784 / 2131.274

V2 = 0.000367L

V2 = 367mL

7 0

3 years ago

According to the law of conservation of matter, which statement about chemical reactions is true?

mihalych1998 [28]

Answer:

Atoms cannot be created or destroyed by chemical reactions.

Explanation:

5 0

3 years ago

10. Hydrogen peroxide (H2O2: M = 34 g mol-1) is a powerful oxidising agent that is used in concentrated solution in rocket fuel

Lubov Fominskaja [6]

Answer:

The molality of solution=12.605 m

Explanation:

We are given that

Molar mass of Hydrogen peroxide, M=34 g/mol

Density of solution, $\rho=1.11gcm^{-3}$

30% Means mass of solute (Hydrogen peroxide)=30 g

Mass of solvent =100-30=70 g

Total mass of solution, m=100 g

Number of moles of solute= $\frac{given\;mass}{molar\;mass}$

Using the formula

Number of moles of hydrogen peroxide= $\frac{30}{34}$

Now, molality of solution

$m=\frac{number\;of\;moles\;of\;solute}{mass\;of\;solvent}\times 1000$

$m=\frac{30}{70\times 34}\times 1000$

$m=12.605 m$

Hence, the molality of solution=12.605 m

6 0

4 years ago

The rate constant for this second‑order reaction is

o-na [289]

Answer:

daddadaddddddddddddddddddddddddddddda

Explanation:

dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd

3 0

3 years ago