3 years ago

I really need helpp

Chemistry

1 answer:

Anna11 [10]3 years ago

8 0

Answer:

option b

Explanation:

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Sodas are not only full of sugar (124 grams/L), but they are also acidic and will dissolve your teeth, composed of hydroxyapatit

Naya [18.7K]

Answer:

The pH of the HCl solution is 3.9

Explanation:

Knowing the molar mass of HCl (36.5g/mol) it is possible to calculate the number of moles of HCl in the solution,

$\frac{1.5x10^{-3}g}{36.5g/mol} = 4.1x10^{-5}moles$ of HCl

HCl is a strong acid and when added to water will form H+ and Cl-, thus the moles of HCl are equal to moles of H+ in 354 mL of water

$\frac{4.1x10^{-5}moles }{354mL} x 1000= 1.16x10^{-4} M$

The concentration of protons in the solutions is $1.16x10^{-4} M$ .

The expression used to calculate the pH is

$pH = -Log ([H^{+}]) = -Log (1.16x10^{-4} M) = 3.9$

Hence, the pH of the HCl solution is 3.9 and Pepsi has a pH of 3.4 approximately, so they have almost the same pH.

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2 years ago

Atoms in a stay in a fixed position and have no freedom to move

dybincka [34]

A solid, but they are constantly vibrating

8 0

2 years ago

Read 2 more answers

23What are 2 methods that scientists use to understand the history of

ozzi

Answer:

enables us to understand those changes which no human being has ever seen (or if they have, they didn't record it) and to relate them to modern changes.

Expl

7 0

3 years ago

How many moles are in 12.0 grams of O2

horrorfan [7]

Answer:

Moles = 0.375

Explanation:

Moles= m/M

= 12/32 = 0.375mol

5 0

2 years ago

A steel bottle contains nitrogen gas at STP. What is the final pressure if the temperature is changed to 155°C?

RoseWind [281]

Answer:

Option D

Explanation:

As we know at

PV = nRT

at STP,

Pressure is 1 atm and temperature is 273 K

$\frac{P_2}{P_1} = \frac{T_2}{T_1} \\P_2 = 1*(428 )/273\\P_2 = 1.567$

Hence, option D is correct

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3 years ago