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3 years ago

Homework: Earth's Outer Layer

Chemistry

1 answer:

Cerrena [4.2K]3 years ago

7 0

Answer:

It goes the crust mantle outer core and inner core. The crust is what we are standing on it has dirt, rock, stone, the mantle it has lots of silicate rocks and magnesium. The outer core has liquid nickel and iron and the inner core has solid metals

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When methanol, CH 3 OH , is burned in the presence of oxygen gas, O 2 , a large amount of heat energy is released. For this reas

luda_lava [24]

<u>Answer:</u> The mass of methanol that must be burned is 24.34 grams

<u>Explanation:</u>

We are given:

Amount of heat produced = 581 kJ

For the given chemical equation:

$CH_3OH(g)+\frac{3}{2}O_2(g)\rightarrow CO_2(g)+2H_2O(l);\Delta H=-764kJ$

By Stoichiometry of the reaction:

When 764 kJ of heat is produced, the amount of methanol reacted is 1 mole

So, when 581 kJ of heat will be produced, the amount of methanol reacted will be = $\frac{1}{764}\times 581=0.7605mol$

To calculate mass for given number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Moles of methanol = 0.7605 moles

Molar mass of methanol = 32 g/mol

Putting values in above equation, we get:

$0.7605mol=\frac{\text{Mass of methanol}}{32g/mol}\\\\\text{Mass of methanol}=(0.7605mol\times 32g/mol)=24.34g$

Hence, the mass of methanol that must be burned is 24.34 grams

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3 years ago

Which quantity represents 0.500 Mole at STP

KIM [24]

0.500 moles is roughly .5*6.022*10^23=3.011*10^23 atoms. This is independent of STP.

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Which equilibrium expression represents the ionization of water?

pav-90 [236]

H₂O + H₂O ⇄ H₃O⁺ + OH⁻

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ehidna [41]

Answer:

E\charged battery to provide electronic difference

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Chicken noodle soup is best described as?

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Well it should be easy in my opinion ill just say its chemical energy because the chicken and the broth and noodles and vegies give you lots of energy exspecially if your gonna have seconds ;)

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