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3 years ago

12

Salt dissolves in water because salt is held together by:

1 answer:

mote1985 [20]3 years ago

7 0

Water can dissolve salt because the positive part ofwater molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions. The amount of a substance that candissolve in a liquid (at a particular temperature) is called the solubility of the substance.

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Consider the following reaction. The system is allowed to reach an equilibrium and then FeS2(s) is added. What will happen if Fe

AveGali [126]

Answer:

More products (Fe2O3 and SO2) will be produced

Explanation:

In the reaction:

4 FeS2(s) + 11 O2(g) ⇌ 2 Fe2O3(s) + 8 SO2(g)

FeS2 is a reactant. When a reactant is added to a reaction which has already reached the equilibrium, more product is produced, so that the equilibrium is reestablished again

8 0

3 years ago

disolvemos 25 g de hidroxido de sodio en agua hasta obtener 500 cm3 de disolucion. ¿Cual es la concentracion molar de la disoluc

LiRa [457]

Answer:

$M=1.25M$

Explanation:

Hola,

Dado que la molaridad de una solución es definida en términos de las moles de soluto y el volumen de la solución en litros:

$M=\frac{n}{V}$

Primero debemos calcular las moles de hidróxido de sodio, teniendo en cuenta que su masa molar es de 40 g/mol:

$n=25gNaOH*\frac{1molNaOH}{40gNaOH}=0.625mol$

Luego, el volumen el litros:

$V=500cm^3*\frac{1L}{1000cm^3} =0.500L$

Así, calculamos la concentración molar de la solución:

$M=\frac{0.625mol}{0.500L}\\ \\M=1.25M$

Saludos!

3 0

3 years ago

Read 2 more answers

A 6.165 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 10.27 grams of CO2 and 3

e-lub [12.9K]

Answer:

Explanation:

mass of carbon in 10.27 g of CO₂ = 12 x 10.27 / 44 = 2.80 g

mass of hydrogen ( H ) in 3.363 g of H₂O = 2 x 3.363 / 18

= .373 g

These masses would have come from the sample of 6.165 g .

Rest of 6.165 g of sample is oxygen .

So oxygen in the sample = 6.165 - ( 2.8 + .373 ) = 2.992 g

Ratio of C , H , O in the sample

2.8 : .373 : 2.992

C: H : O : : 2.8 : .373 : 2.992

Ratio of moles

C: H : O : : 2.8/12 : .373/1 : 2.992 / 16

C: H : O : : .2333 : .373 : .187

C: H : O : : .2333/.187 : .373/.187 : .187/.187

C: H : O : : 1.247 : 1.99 : 1

C: H : O : : 5 : 8 : 4 ( after multiplying by 4 )

Hence empirical formula

C₅H₈O₄

Molecular formula ( C₅H₈O₄ )n

n ( 5 x 12 + 8 x 1 + 4 x 16 ) = 132

n x ( 60 + 8 + 64 ) = 132

n = 1

Molecular formula = C₅H₈O₄.

3 0

3 years ago

PLZ HELP For the reaction: 2NO2(g) → N2O4(l),

Furkat [3]

Answer: $\Delta H_{rxn}=-20kJ/mol-(+66kJ/mol)$

Explanation:

Heat of reaction or enthalpy change is the energy released or absorbed during the course of the reaction.

It is calculated by subtracting the enthalpy of reactants from the enthalpy of products.

$\Delta H=H_{products}-H_{reactants}$

$\Delta H$ = enthalpy change = ?

$H_{products}$ = enthalpy of products

$H_{reactants}$ = enthalpy of reactants

For the given reaction :

$2NO_2(g)\rightarrow N_2O_4(l)$

$\Delta H=H_{N_2O_4}-2\times H_{NO_2}$

$\Delta H=-20kJ/mol-(+66kJ/mol)$

6 0

3 years ago

Why is alloy stainless steel used instead of pure iron for the ball of pen of pure iron for a ball of pen

Anna [14]

Answer:

so it want get so hot

Explanation:

so you want get burned

7 0

4 years ago