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3 years ago

Please help me im stuck on this!!

Chemistry

2 answers:

solmaris [256]3 years ago

8 0

MnSO₄ → MnO +SO₃

The type of reaction above is decomposition reaction

Explanation

Decomposition reaction is type of chemical reaction that involve breaking down of a compound into smaller compounds or individual elements.

MnSo₄ is broken down into MnO and SO₃ therefore the reaction above is a decomposition reaction.

On the other hand synthesis reaction is chemical reaction that involve two or more elements or compounds which combine to form a single product.

lisov135 [29]3 years ago

6 0

The answer is decomposition

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The freezing point of ethanol, CH3CH2OH, is -117.300 °C at 1 atmosphere. Kf(ethanol) = 1.99 °C/m

MAXImum [283]

Answer : The molecular weight of this compound is 891.10 g/mol

Explanation : Given,

Mass of compound = 12.70 g

Mass of ethanol = 216.5 g

Formula used :

$\Delta T_f=i\times K_f\times m\\\\T_f^o-T_f=i\times T_f\times\frac{\text{Mass of compound}\times 1000}{\text{Molar mass of compound}\times \text{Mass of ethanol}}$

where,

$\Delta T_f$ = change in freezing point

$T_f^o$ = temperature of pure ethanol = $-117.300^oC$

$T_f$ = temperature of solution = $-117.431^oC$

$K_f$ = freezing point constant of ethanol = $1.99^oC/m$

i = van't hoff factor = 1 (for non-electrolyte)

m = molality

Now put all the given values in this formula, we get

$(-117.300)-(-117.431)=1\times 1.99^oC/m\times \frac{12.70g\times 1000}{\text{Molar mass of compound}\times 216.5g}$

$\text{Molar mass of compound}=891.10g/mol$

Therefore, the molecular weight of this compound is 891.10 g/mol

7 0

3 years ago

urgent please help!!!!!! Which factors add to the greenhouse effect and are caused by human activities? Select two options. a de

Sav [38]

Answer:

I would say that the answers are an increase in gases in the atmosphere that absorb heat an increase in surfaces that radiate energy into the atmosphere, and a decrease in the amount of water on Earth’s surface

Explanation:

4 0

3 years ago

Imagine that the apparent weight of the crown in water is <img src="https://tex.z-dn.net/?f=W_%7Bapparent%7D" id="TexFormula1" t

Ahat [919]

Answer : The crown is not made of pure (100%) gold.

Explanation :

Formula used :

$\frac{W_{apparent}}{W_{actual}}=1-\frac{\rho_w}{\rho_c}$

where,

$W_{apparent}$ = apparent weight of the crown in water = 4.50 N

$W_{actual}$ = actual weight = 5.00 N

$\rho_w$ = density of water = $1.00g/cm^3$

$\rho_c$ = density of crown = ?

Now put all the given values in the above formula, we get:

$\frac{4.50N}{5.00N}=1-\frac{1.00g/cm^3}{\rho_c}$

$\rho_c=10g/cm^3$

Density of crown < Density of gold

$10g/cm^3$

Thus, the crown is not made of pure (100%) gold.

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4 years ago

What information would b requird to determine the mass of nitrogen (n)?

oee [108]

7 protons and 7 neutrons

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3 years ago

A chemical reaction that removes electrons from an atom is called a(n) ________ reaction.

ch4aika [34]

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3 years ago