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____ [38]
3 years ago
9

Perform the following operation

Chemistry
1 answer:
Gekata [30.6K]3 years ago
4 0

Explanation:

Perform the following operation

and express the answer in

scientific notation.

5.4x103 x 1.2x107

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Determine the number of bonding electrons and the number of nonbonding electrons in the structure of cs2.
trapecia [35]
Carbon disulfide ( S=C=S)  is made up of one carbon atom and two sulfur atom. 
Carbon has 4 valence electrons while sulfur has 6 electrons. 
During bonding all the four carbon valence electrons are used in bonding while each sulfur atom contributes two electrons two the bond formation.
Therefore; 4 + 2(2) = 8 electrons are used for bonding, while 8 electrons ( four from each sulfur atom) are not used for bond formation. 
3 0
3 years ago
Read 2 more answers
What mass of Na2SO4 is needed to make 2.5L of 2.0 M solution?
Gala2k [10]
Moles of Na2SO4 = conc. x volume(dm3)
= 2 x (2500cm3/1000)
= 5 mol


Mass of Na2SO4 = moles x molar mass
= 5 x ((23 x 2) + 32.1 + (16 x 4))
= 710.5g
5 0
3 years ago
In a coffee-cup calorimeter, 50.0ml of 0.100M AgNO3 and50.0ml of 0.100M HCl are mixed to yield the following reaction:
Marina CMI [18]

Answer:

-66.88KJ/mol

Explanation:

It is possible to obtain the heat involved in a reaction using a calorimeter. Formula is:

q = -C×m×ΔT

<em>Where q is heat of reaction, C is specific heat capacity (4.18J/°Cg), m is mass of solution (100.0g) and ΔT is temperature change (23.40°C-22.60°C = 0.80°C)</em>

Replacing:

q = -4.18J/°Cg×100.0g×0.80°C

q = -334.4J

Now, in the reaction:

Ag⁺ + Cl⁻→ AgCl

<em>AgNO₃ as source of Ag⁺ and HCl as source of Cl⁻</em>

Moles that react are:

0.050L× (0.100mol /L) = 0.0050moles

If 0.0050 moles produce -334.4J. Heat of reaction is:

-334.4J / 0.0050moles = -66880J/mol = <em>-66.88KJ/mol</em>

5 0
3 years ago
The equation for the chemical reaction shown below is not balanced. What number should replace the question mark to balance this
malfutka [58]
B. the number 3.
there are 2Al's on both sides and 6 Cl's on the right side so to balance it, you multiply Cl2 by 3 to get 6 Cl's.
6 0
3 years ago
What are the number of protons, neutrons, and electrons in an atom of Tellurium- 129?
deff fn [24]

Answer:

Number of protons = 52, Number of electrons = 52, Number of neutrons = 76

Explanation:

3 0
3 years ago
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