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3 years ago

Given 2Na + 2H2O → 2NaOH + H2, how many grams of oxygen are produced if 300.00 grams of Na are reacted with water?

1 answer:

8 0

First you have to find the number of moles , then you have to apply stoichometry to find the number of moles of H2 gas , after that you can determine its mass.

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The basic building blocks of a protein are

snow_lady [41]

The building blocks of protein are amino acids.

Amino acids are a class of organic compounds that contain at least one amino group, -NH2, and carboxyl group, -COOH.

Alpha amino acids , RCH(NH2)COOH, are the building blocks from which proteins are constructed.

The NH group of one amino acid and the COOH group of the other amino acid are joined together and a peptide bond -CONH- is formed between the two amino acids and the product is called a dipeptide.

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3 years ago

Oxygen gas, generated by the reaction 2KClO3(s)---2KCl(s)+3O2(g), is collected over water at 27•C in 3.72L vassel at a total pre

Julli [10]

Answer:

moles = 0.093 moles

Explanation:

In this case, we know that this reaction is taking plave in a vessel that has a 730 torr of total pressure.

The total pressure is a value obtained by:

Pt = Pwater + PO2

We need to know the pressure of O2, because then, with stoichiometry, we can calculate the moles of KClO3

The pressure of oxygen is:

PO2 = 730 - 26 = 704 Torr

Now, this pressure is in Torr, and we need to convert it to Atm, so:

704 Torr / 760 Torr = 0.9263 atm

Now, let's use the ideal gas equation:

PV = nRT

With this expression, we will calculate the moles of O2, and then, the moles of KClO3:

n = PV/RT

R = 0.082 L atm /K mol

P = 0.9263 atm

V = 3.72 L

T = 27 + 273 = 300 K

Replacing the data:

n = 0.9263 * 3.72 / 300 * 0.082

n = 0.14 moles

Finally, by stoichiometry, we know that 2 moles of KClO3 produces 3 moles of O2, so:

moles of KClO3 = 0.14 * 2/3 = 0.093 moles of KClO3

6 0

3 years ago

A sample of ch4o with a mass of 32.0 g contains ________ molecules of ch4o.

ValentinkaMS [17]

6.02 times 10 to the 23 power, which is Avogadros number

3 0

4 years ago

Write the formula for the binary compound iron (III) oxide. (a)FeO , (b)Fe(III)O (c),Fe3O2 ,(d)Fe2O3

marishachu [46]

Answer:

I^3, aFeO BfEi^3 O, c, dFe^2 O^3

Explanation:

6 0

3 years ago

. Write the following isotope in nuclide notation (e.g., “ ”): copper-70

Ede4ka [16]

Answer:

$^{70}_{29}Cu$

Explanation:

The nuclide isotope notation represents the isotope by its chemical symbol preceded by a superscript (to the left of the chemical symbol) showing the mass number and a subscript (also the the left of the chemical symbol) showing the atomic number (number of protons).

Copper-70:

Chemical symbol: Cu
Mass number: 70
Atomic number: 29 (the atomic number is found in any periodic table)

Nuclide notation:

$^{70}_{29}Cu$

6 0

4 years ago