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ElenaW [278]
3 years ago
10

According to the Periodic Table of Elements, Calcium has:

Chemistry
1 answer:
lana [24]3 years ago
3 0

Answer:

20 protons and 20 electrons

Explanation:

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Q6. A student mixes 50.0 mL of 1.00 M Ba(OH)2 with 86.4 mL of 0.494 M H2SO4. Calculate the
skelet666 [1.2K]

Answer:

The correct answer should be 12.72 pH of the mixed solution and 9.94g mass of solid BASO4 formed.

Explanation:

The molecules of Ba(OH)2 are : 1.00M x 0.05L = 0.05 ( moles )

The molecules of H2SO4 are : 0.494M x 0.0864L = 0.0426816

Ba(OH)2 + H2SO4 ----> BaSO4 + 2 H2O

0.0426816<--- 0.0426816

The mixed solution is Ba(OH)2 with 0.05 - 0.0426816 = 0.0073184

The concentration of mixed solution is : 0.0073184 : ( 0.05 + 0.0864 ) = 0.054 M

The pH of mixed solution is 14 - -log[0.054] = 14 - 1.27 = 12.73 PH

And the mass of BaSO4 is 0.0426816 x ( 137 + 32 + 16 x 4 ) = 9.94 gams.

6 0
3 years ago
If a chemical reaction is carried out in four steps and the same reaction can be
Advocard [28]
<h2><em><u>Answer - </u></em>b) Be the same as in the second method</h2>

<h3>Brief explanation:</h3>

Enthalpy is an state function that does not depend on the path followed to carry out the reaction but depends upon the initial and final state of system. In above statement both the reaction are same hence the enthalpy change would also be same. This can also be represent in the form of equation,

<h3> ΔHsys = Hf - Hi</h3>

Where,

  • ΔHsys is change in enthalpy of system
  • Hf is enthalpy of reaction at final state
  • Hi is enthalpy of reaction at initial state

Thank you for joining brainly community.

6 0
3 years ago
Find the distance traveled by a car that travels with an average speed of 110 km/h for 3.5hrs
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110 times 3.5 = 385km
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Which planetary body has the GREATEST gravitational pull? A) Jupiter B) Neptune C) the Moon D) the Earth
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A) Jupiter because it has the largest mass of all the planets
7 0
3 years ago
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Beta particles are emitted from radioactive atom p when it disintegrates spontaneously to form non radioactive atom q. which of
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the answer is radioactive atoms p ...............................

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