CHEMISTRY MIDDLE SCHOOL

What is the mass, in grams, of 1.50×1021 molecules of aspirin, C9H8O4?Express your answer using three significant figures.

Answers

Answer 1

Answer:

Answer: m = 0.448 g C9H8O4

Explanation: Solution attached

Convert molecules of C9H8O4 to moles using the Avogadro's number

Convert moles of C9H8O4 to mass using its molar mass.

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Explain what might happen if a doctor did not wear gloves when treating patients

Answers

If they didn't wear gloves while treating patients then they could get the bacteria from the hands onto the patient and it could lead to an infection.

He might spread germs and get other people sick and himself sick.

What do all four of these molecules have in common? A.
They are essential to life.

B.
They carry signals.

C.
They are water soluble.

D.
They act as a source of energy

Answers

I did a quick search and found the diagram. Let's go through these and solve by elimination.

B. Proteins can act as receptors which I guess could be considered a signal, but the rest of the molecules do not. B is incorrect.

C. Lipids are not water soluble. An example of lipids are fats, and oils. Have you ever tried combining water and oil? Think about salad dressing, it does not mix. C is incorrect.

D. Carbohydrates and lipids are sources of energy, but nucleic acids and proteins are not. D is incorrect.

The answer is A. because we know that our bodies are made up of nucleic acids, protein, fats, and we need carbohydrates in order to live normal, healthy lives.

A. They are Essential to Life

_Cuo +H, → _Cu + _H,0

Answers

Answer:

CuO(s) + H₂(g) → Cu(s) + H₂O(l)

Explanation:

Assuming the reaction is the reduction of CuO by H₂
Then the balanced equation for the reaction is;

CuO(s) + H₂(g) → Cu(s) + H₂O(l)

The equation shows the reducing property of hydrogen gas, such that hydrogen reduces metal oxides such as copper(ii)oxide to the respective metals.
The law of conservation requires chemical equations to be balanced so as the mass of reactants will be equal to that of products.

In this case; there is 1 copper atom, 1 oxygen atom and 2 hydrogen atoms on both side of the equation and thus the equation is balanced.

Consider the following reversible reaction. 2H2O(g)<—>2H2(g)+O2(g) What is the equilibrium constant expression for the given system?

Answers

Answer : The equilibrium constant expression will be,

$k_(eq)=([H_2]^2[O_2])/([H_2O]^2)$

Explanation :

The given balanced chemical reaction is,

$2H_2O(g)\rightleftharpoons 2H_2(g)+O_2(g)$

The equilibrium expression for the reaction is determined by multiplying the concentrations of products and divided by the concentrations of the reactants and each concentration is raised to the power that is equal to the coefficient in the balanced reaction.

The concentrations of pure solids are constant that is they do not change. Thus, they are not included in the equilibrium expression.

So, the equilibrium constant expression will be,

$k_(eq)=([H_2]^2[O_2])/([H_2O]^2)$

Answer: D

Explanation:

What can fossils tell us about movements of the plates in the past