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blagie [28]
3 years ago
13

What is the mass of 6. 02 x 1023 atoms of carbon-12?.

Chemistry
1 answer:
OlgaM077 [116]3 years ago
5 0

Answer:

One mole of oxygen atoms contains 6.02214179×1023 oxygen atoms. Also, one mole of nitrogen atoms contains 6.02214179×1023 nitrogen atoms. … So, each carbon-12 atom weighs about 1.99265×10−23g

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Write a chemical equation that illustrates the autoionization of water.
Naya [18.7K]

Answer:

The autoionization of water is:

2H₂O ⇄  H₃O⁺  +  OH⁻        Kw

Explanation

2 moles of water can generate hydronium and hydroxide, when they work as an acid or as a base

If we take account that the concentration of protons (hydroniums), at the standard temperature is 1×10⁻⁷ M, it can be considered that the molarity of water is a constant that can be incorporated into a “greater” constant that also includes to Kc and that is known as ionic product of water, Kw. The expression is:

Kw = [H₃O⁺] . [OH⁻] / [H₂O]²

We do not include water → Kw =  [H₃O⁺] . [OH⁻]

Since the water dissociation reaction produces the same concentration of H₃O⁺ as OH⁻, [OH⁻] in pure water will also be 1×10⁻⁷ M

Kw = 1×10⁻⁷ . 1×10⁻⁷ = 1×10⁻¹⁴

pKw = pH + pOH

14 = 7 + 7

8 0
4 years ago
Lead nitrate can be decomposed by heating. what is the percent yield of the decomposition reaction if 9.9 g of pb(no3)2are heate
Helga [31]
The answer is 82%. . .
5 0
3 years ago
A 211 g sample of barium carbonate, baco3, reacts with a solution of nitric acid to give barium nitrate, carbon dioxide, and wat
bija089 [108]
Answer:
            Mass  =  47.04 g 

            Volume  =  23.94 L 

Solution:

The equation for given reaction is as follow,

                  BaCO₃  +  2 HNO₃     →     Ba(NO₃)₂  +  CO₂  +  H₂O

According to this equation,

            197.34 g (1 mole) BaCO₃ produces  =  44 g (1 mole) of CO₂
So,
                       211 g of BaCO₃ will produce  =  X g of CO₂

Solving for X,
                     X  =  (211 g × 44 g) ÷ 197.34 g

                     X  =  47.04 g of CO₂

As we know,

                  44 g (1 mole) CO₂ at STP occupies  =  22.4 L volume
So,
                                47.04 g of CO₂ will occupy  =  X L of Volume

Solving for X,
                     X  =  (47.04 g × 22.4 L) ÷ 44 g

                     X  =  23.94 L Volume
8 0
4 years ago
The movement of fluids up and down in a cycle because of convection is_____
kirill [66]
Called a(n) convection current
5 0
3 years ago
The particles in a ____________________ have an orderly, fixed arrangement.
amid [387]
The particles in a solid have an orderly, fixed arrangement.
8 0
3 years ago
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