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2 years ago

There are ___ atoms of oxygen in 300 molecules of CH3CO2H a) 300 b) 600 c) 150 d) 3.6 x 10^36

Chemistry

1 answer:

Maurinko [17]2 years ago

8 0

Answer: The correct option is b) 600

Explanation:

Molecules are formed when two atoms of same or different elements combine together.

Atoms are the smallest unit of matter that combines to form a compound.

For the given chemical compound, $CH_3CO_2H$

Given number of molecules = 300 molecules

In 1 mole of the given chemical compound, there are 2 atoms of carbon, 4 atoms of hydrogen and 2 atoms of oxygen

Number of atoms of oxygen = $2\times \text{Number of molecules of compound}$

Number of atoms of oxygen = $2\times 300=600atoms$

Hence, the correct option is b) 600

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J. Explain how an atom's valence electron configuration determines its place on the periodic table.

Darya [45]

Answer:

Elements having same valence electrons are placed in same group.

Explanation:

First, let's start with some basic concepts of modern periodic table:

1. Modern Periodic table : It is the arrangement of element in the increasing order of their atomic numbers

The Modern periodic table is divided into Periods and groups .

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Same period have same number of atomic orbital(Shell)

Group : The group is the vertical columns . There are 18 groups in the modern periodic table.Those element which have same group number will also have same number of electron in their outermost shell. The number of electron in the outermost shell determines the valency of the element.

So, elements showing same valency are placed in same group.

All alkali are place in group 1 and have 1 valance electron in the outermost shell

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3 years ago

What happens to pressure as temperature increases and temperature decreases

likoan [24]

When temperature increases pressure also increases.

When temperature decreases pressure decreases.

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2 years ago

Read 2 more answers

What is the definition of incandescence?

Vilka [71]

Answer:

the emission of visible light by a body, caused by its high temperature.Compare luminescence.

the light produced by such an emission.

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1 year ago

What is the volume of 0.80 grams of O2 gas at STP? (5 points) Group of answer choices 0.59 liters 0.56 liters 0.50 liters 0.47 l

Anarel [89]

Answer:

0.56 liters

Explanation:

First we convert 0.80 grams of O₂ into moles, using its molar mass:

0.80 g ÷ 32 g/mol = 0.025 mol

At STP, 1 mol of any given mass occupies 22.4 L. With that information in mind we calculate the volume that 0.025 moles of O₂ gas would occupy:

0.025 mol * 22.4 L/mol = 0.56 L

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2 years ago

The balanced redox reactions for the sequential reduction of vanadium are given below.

Minchanka [31]

Answer : 0.0392 grams of Zn metal would be required to completely reduced the vanadium.

Explanation :

Let us rewrite the given equations again.

$2VO_{2}^{+} (aq)+ 4H^{+}(aq) + Zn (s)\rightarrow 2VO^{2+}(aq)+Zn^{2+}+2H2O(l)$ $2VO^{2+}(aq)+ 4H^{+}(aq) + Zn (s)\rightarrow 2V^{3+} (aq)+Zn^{2+}+2H2O(l)$