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2 years ago

Can anyone explain why the mongols invaded russia?

Chemistry

2 answers:

Gelneren [198K]2 years ago

7 0

Answer:

It all started when Genghis Khan (1155-1227), the founder of the Mongol Empire, sent his son Jochi (1182-1227) to conquer the lands of what is now Siberia, Central Russia, and Eastern Europe. Giant armies of Mongol warriors (clearly over 100,000, an enormous number in the 13th century) easily defeated the weak and ill-numbered forces of the Russian princes, who were at war with each other before the invasion.

In 1237, the Mongols, led by Batu Khan, invaded Rus’. They took, ravaged and burned Ryazan’, Kolomna, Moscow, Vladimir, Tver – all the main Russian cities. The invasion continued until 1242 and was a terrible blow for the Russian lands – it took almost 100 years to fully recover from the damage the Mongol army did. Also, the lands and cities of the South – Kiev, Chernigov, Halych were burned to the ground. The North-Eastern lands, most notably Tver, Moscow, Vladimir, and Suzdal became the main cities after the invasion.

However, the Mongols didn’t want to conquer the land fully – they just wanted stable tributes. And they knew how to get what they wanted.

Explanation:

Svetach [21]2 years ago

5 0

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2 years ago

A sample was prepared by mixing 18. ml of 3.00 x 10^-3 m crystal violet (cv) with 2.00 ml of 0.250 m naoh. calculate the resulti

Aleks [24]

Answer : The resulting concentrations of CV and NaOH are 0.0027 M and 0.025 M respectively.

Explanation :

Step 1 : Find moles of crystal violet and NaOH.

The molarity formula is

$Molarity = \frac{mol}{L}$

Molarity of crystal violet = $3.00 \times 10^{-3} = \frac{mol (CrystalViolet)}{L}$

The volume of crystal violet solution is 18 mL which is 0.018 L.

Moles of crystal violet = $3.00 \times 10^{-3} \times 0.018 = 5.4 \times 10^{-5}$

Moles of crystal violet = 5.4 x 10⁻⁵

Moles of NaOH = $Molarity \times L = 0.250 \times 0.00200 = 5.00 \times 10^{-4}$

Moles of NaOH = 5.00 x 10⁻⁴

Step 2 : Find total volume of the solution

The total volume of the solution after mixing NaOH and crystal violet is

0.018 L + 0.00200 = 0.020 L

Step 3 : Use molarity formula to find final concentrations

Molarity of crystal violet = $\frac{mol(CrystalViolet)}{Total Volume(L) } = \frac{5.4 \times 10^{-5}}{0.020} = 2.7 \times 10^{-3}$

Final concentration of CV = 0.0027 M

Molarity of NaOH= $\frac{mol(NaOH)}{Total Volume(L) } = \frac{5.00 \times 10^{-4}}{0.020} = 0.025 \times 10^{-3}$

NaOH is a strong base and dissociates completely as follows.

$NaOH (aq) \rightarrow Na^{+} (aq) + OH^{-} (aq)$

The mole ratio of NaOH and OH⁻ is 1:1 . Therefore the concentration of OH⁻ is same as that of NaOH.

Concentration of OH⁻ = 0.025 M

8 0

3 years ago

A student needs to prepare 100. mL of 0.612 M Cu(NO3)2 solution. What mass, in grams, of copper(II) nitrate should the student u

Temka [501]

Answer: 11.5 grams

Explanation:

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$V_s$ = volume of solution in ml = 100 ml

Now put all the given values in the formula of molarity, we get

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