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abruzzese [7]
3 years ago
13

Atoms or ___ make up molecules.

Chemistry
2 answers:
Arte-miy333 [17]3 years ago
8 0

Answer:

Oxygen y

Explanation:

ella [17]3 years ago
7 0

Answer:

protones

Explanation:

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If an atom has 10 protons and electrons how many of the electrons will be valence electrons?
Snezhnost [94]

Answer:

8 of the electrons will be valence electrons

Explanation:

7 0
2 years ago
Read 2 more answers
Acetylsalicylic acid (aspirin), HC9H7O4, is the most widely used pain reliever and fever reducer. Find the pH of 0.035 M aqueous
KatRina [158]

<u> </u> The pH of 0.035 M aqueous aspirin is 2.48

<u>Explanation:</u>

We are given:

Concentration of aspirin = 0.035 M

The chemical equation for the dissociation of aspirin (acetylsalicylic acid) follows:

               HC_9H_7O_4\rightleftharpoons H^++C_9H_7O_4^-

<u>Initial:</u>         0.035

<u>At eqllm:</u>    0.035-x        x         x

The expression of K_a for above equation follows:

K_a=\frac{[C_9H_7O_4^-][H^+]}{[HC_9H_7O_4]}

We are given:

K_a=3.6\times 10^{-4}

Putting values in above expression, we get:

3.6\times 10^{-4}=\frac{x\times x}{(0.035-x)}\\\\x=-0.0037,0.0033

Neglecting the value of x = -0.0037 because concentration cannot be negative

So, concentration of H^+ = x = 0.0033 M

  • To calculate the pH of the solution, we use the equation:

pH=-\log[H^+]

We are given:

H^+ = 0.0033 M

Putting values in above equation, we get:

pH=-\log(0.0033)\\\\pH=2.48

Hence, the pH of 0.035 M aqueous aspirin is 2.48

7 0
3 years ago
How many grams are in 34,358 mg?<br> "answer with 1 decimal place and no unit
saveliy_v [14]

Answer:

34.4

Explanation:

You would divide the mg by 1000 to get the number of grams.

3 0
2 years ago
What amount in moles does 242 L of carbon dioxide occupy at 1.32 atm and 20 degrees C
Gelneren [198K]

Answer:

13.28 mol.

Explanation:

  • We can use the general law of ideal gas:<em> PV = nRT.</em>

where, P is the pressure of the gas in atm (P = 1.32 atm).

V is the volume of the gas in L (V = 242.0 L).

n is the no. of moles of the gas in mol (n = ??? mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K).

T is the temperature of the gas in K (T = 20.0° + 273 = 293.0 K).

∴ n = PV/RT = (1.32 atm)(242.0 L)/(0.0821 L.atm/mol.K)(293.0 K) = 13.28 mol.

7 0
3 years ago
3. What are the product (s) of the following reaction: Sodium + Bromine =
tatuchka [14]

Answer:

sodium bromide

Explanation:

Na+Br2=NaBr

3 0
2 years ago
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