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3 years ago

Someone pleaseeeeee help with my chemistry.

Chemistry

1 answer:

victus00 [196]3 years ago

3 0

Answer:

1.)In an oxygen atom,there are 8 protons and 8 electrons.Most oxygen atoms also have 8 neutrons,but it is possible for an oxygen atom to have 9 or 10 neutrons.They are just rarer.The oxygen we breathe is not atomic form.

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38.0 mL of a 0.026 M solution of HCl is needed to react completely with a 0.032 M NaOH solution. Calculate the number of moles o

svet-max [94.6K]

Answer:

The number of moles of HCl actually present is 0.000988

Explanation:

The balanced chemical equation of the given reaction is 

$HCl+NaOH \rightarrow NaCl+H_2 O$

Here one mole of HCl reacts with one mole of NaOH to form one mole of NaCl and one mole of water. Here the molarity of HCl is given as 0.026M.

molarity of NaOH is 0.032M 

molarity is the number of moles per unit volume of solution.

we have to calculate the number of moles in 36 mL of HCl.

38 mL=36/1000=0.038L 

the number of moles in 38 mL of HCl is given by 

no of moles = $0.026 \times 0.038=0.000988$ 

5 0

4 years ago

Which of the following substances is NOT an acid? 25 POINTS!!!!!

melomori [17]

Answer:

1:is option A as it have OH- group (base)

2:a),antacid as it's weak base

4 0

3 years ago

Help! Pls tell me the meanings of all of these words and please try to make them short as possible!!! tysm have a great day! &lt

Alex Ar [27]

Answer:

Biofuel: Fuel from living matter

Conservertion of energy: It's a law where energy, when bodies/particles touch in a close system stays constant.

Conduction: Where via touch heat/electricity travels to a diffrent thing.

5 0

3 years ago

A sample of nitrogen gas, stored in a 2.96-L container at 32.0°C, exerts a pressure of 4.27 atm. Calculate the number of moles o

inysia [295]

Answer: The number of moles of nitrogen gas is 0.505 moles.

Explanation:

To calculate the number of moles of nitrogen gas, we use ideal gas equation, which is:

$PV=nRT$

where,

P = pressure of the gas = 4.27 atm

V = Volume of the gas = 2.96 L

T = Temperature of the gas = $32.0^oC=[32.0+273]K=305K$

R = Gas constant = $0.0821\text{ L. atm }mol^{-1}K^{-1}$

n = number of moles of gas = ?

Putting values in above equation, we get:

$4.27atm\times 2.96L=n\times 0.0821\text{ L atm }mol^{-1}K^{-1}\times 305K\\n=0.505mol$

Hence, the number of moles of nitrogen gas is 0.505 moles.

6 0

4 years ago

Read 2 more answers

Which of the following statements is true?

12345 [234]

Answer:

c. Hfus is always negative.

Explanation:

Because energy is released when fusing solids

8 0

3 years ago