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4 years ago

14

¿En qué fecha, Mendeléiev creo su tabla periódica según la leyenda?

1 answer:

musickatia [10]4 years ago

6 0

Answer:

Legend has it that Mendeleev conceived and created his table in a single day: February 17, 1869, on the Russian calendar (March 1 in most of the rest of the world).READ THE EXPLANATION

Explanation:

La leyenda dice que Mendeleev concibió y creó su mesa en un solo día: 17 de febrero de 1869, en el calendario ruso (1 de marzo en la mayoría del resto del mundo).

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Ethanol, CH.0, is common beverage alcohol. At its boiling point of 78.5 °C, the enthalpy of vaporization of ethanol is 38.6 kJ/m

garik1379 [7]

Answer:

209.8 kilo Joules heat is required to vaporize 250 g of ethanol at 78.5 °C.

Explanation:

Mass of an ethanol = 250 g

Molar mass of ethanol = 46 g/mol

Moles of an ethanol = $n=\frac{250 g}{46 g/mol}=5.435 mol$

Enthalpy of vaporization of ethanol = $\Delta H_{vap} =38.6 kJ/mol$

Heat required to vaporize 250 g of ethanol at 78.5 °C : Q

$Q=n\times \Delta H_{vap}$

$=5.435 mol\times 38.6 kJ/mol=209.7826 kJ\approx 209.8kJ$

Q = 209.8 kilo Joules

6 0

4 years ago

A 40-kg dog on roller skates is acceleration at 2 m/s^2. What is the net force of the dog

vaieri [72.5K]

Answer:

<h2>80 N</h2>

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 40 × 2

We have the final answer as

<h3>80 N</h3>

Hope this helps you

7 0

3 years ago

Contains a nonmetal and metal

Dahasolnce [82]

Salt - Na Cl
Sodium(metal) and chloride(nonmetal)

3 0

3 years ago

2. The table shows the scientific names and the common names of four plants. Which word in their names shows that two of the pla

posledela

Explanation:

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4 0

3 years ago

Hydrogen bonds are

ella [17]

Answer:

c

Explanation:

hydrogen bonds are initially weak and collectively strong because they are partially positive ions

3 0

3 years ago