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adelina 88 [10]
3 years ago
10

Find the density of a cube on Earth that weighs 1.5 kg and has a side-length of 10 cm.

Chemistry
1 answer:
tamaranim1 [39]3 years ago
3 0

Answer:

1500kg/m^3

Explanation:

Formula:

d=m/v

Given:

m=1.5kg

v=1000cm^3

(The side length of a cube is always equal to the others)

Required:

d=?

Solution:

d=m/v

d=1.5kg/1000cm^3

d=1.5kg/0.001m^3

d=1500kg/m^3

Hope this helps ;) ❤❤❤

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miss Akunina [59]
<span>Given mass: 3.810 g of h2o and 13.96 g of co2. Mass of CO2 : 13.96 g moles of CO2 : 0.317 moles / 44.0098 moles of C : 0.317 moles Mass of water = 3.81 g moles of water = 0.212 moles / 18.015 moles of H = 0.423 moles X2 Hence the molar ratio C : H is 0.317 : 0.423 = 1.000 : 1.334 Multiplying by 3 on both ratios we get: 3.000 : 4.003 Therefore the empirical formula is C3H4</span>
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3 years ago
Use bond enthalpy values to calculate the enthalpy change for the following reaction. Then, label if the reaction is endothermic
Mila [183]

Based on the bond energies given, the enthalpy change for the reaction of is -33 kJ and the reaction is exothermic.

<h3>What is the change in bond energy of a reaction?</h3>

The change in bond energy of a reaction is calculated using the formula below:

  • change in bond energy = sum of energies of bonds broken - sum of energies of bonds formed

A reaction is exothermic if the change in bond energy is negative.

A reaction is endothermic if the change in bond energy is positive.

Given the bond enery values above:

sum of energies of bonds broken = 4 × C-H + Br-Br

sum of energies of bonds broken = 4 × 413 + 193 = 1845 kJ

sum of energies of bonds formed = 3 × C-H + C-Br + H-Br

sum of energies of bonds formed = 3 × 413 + 276 + 363 = 1878 kJ

Thus;

change in bond energy = 1845 - 1878 = -33 kJ

  • The reaction is exothermic because the change in bond energy is negative.

Therefore, the enthalpy change for the reaction of is -33 kJ and the reaction is exothermic.

Learn more about enthalpy change at: brainly.com/question/11628413

7 0
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Answer:

18 is a

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Explanation:

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andriy [413]

Answer:

Li

Explanation:

Is the element of the first group and is the second smallest of its group. Even Magnesium is in the same situation, but if you compare the atomic radius of lithium and magnesium, the first one is smaller.

Barium definitely is incorrect because is the one that has the biggest radius of its group.

Beryllium is the first of its group so it can not fit the description.

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Answer:

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Explanation:

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