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lisov135 [29]
3 years ago
14

Sodium metal and water react to form sodium hydroxide and hydrogen gas:

Chemistry
1 answer:
asambeis [7]3 years ago
8 0

Answer:

Mass of sodium react = 8.63 g

Explanation:

Given data:

Mass of sodium hydroxide produced = 15 g

Mass of sodium react = ?

Solution:

Chemical equation:

2Na + 2H₂O  → H₂ + 2NaOH

Number of moles of sodium hydroxide:

Number of moles =  mass/ molar mass

Number of moles = 15 g/ 40 g/mol

Number of moles = 0.375 mol

Now we will compare the moles of Sodium and sodium hydroxide.

                        NaOH         :         Na

                          2               :          2

                        0.375         :       0.375

Mass of Sodium:

Mass = number of moles × molar mass

Mass = 0.375 mol× 23 g/mol

Mass = 8.63 g

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There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. Cac
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Explanation:

we have the following balanced reaction:

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the value of K for this reaction will be equal to:

K = ([C2H2] * [Ca(OH)2])/([CaC2] * [H2O]^2)

if we multiply the reaction by the value of 6, we have:

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Again, the value of K for this reaction will be equal to:

K,´ = ([C2H2] ^6 * [Ca(OH)2]^6)/([CaC2]^6 * [H2O]^12) = K^6

For the second reaction:

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we also have:

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4 0
3 years ago
Perform the following operationand express the answer inscientific notation.7.00x10^5 - 5.00x10^4
11Alexandr11 [23.1K]

Taking into account the scientific notation,  the result of the subtraction is 6.5×10⁵.

<h3>Scientific notation</h3>

First, remember that scientific notation is a quick way to represent a number using powers of base ten.

The numbers are written as a product:

a×10ⁿ

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<h3 /><h3>Subtraction in scientific notation</h3>

You want to subtract two numbers in scientific notation. It should be noted that when the numbers to be added do not have the same base 10 exponent, the base 10 power with the highest exponent must be found. In this case, the highest exponent is 5.

Then all the values ​​are expressed as a function of the base 10 exponent with the highest exponent. In this case: 5.00×10⁴=0.500×10⁵

Taking the quantities to the same exponent, all you have to do is subtract what was previously called the number "a". In this case:

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Finally, the result of the subtraction is 6.5×10⁵.

Learn more about scientific notation:

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3 0
1 year ago
What is the bond angle in a tetrahedral molecule?
levacccp [35]
109.5

tetrahedral shape:
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Answer: OC

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