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2 years ago

A certain element forms an ion with 10 electrons and a charge of +2. identify the element.

1 answer:

3 0

An element with a charge +2 means it loses two electrons, whenever an atom or element has positive charge it means it loses electrons. +2 charge means atom loses 2 electrons and now electrons are 10. so before there was 12 electrons and an element with 12 electrons means its atomic number is 12. An element with atomic number 12 is magnesium.

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For which of the following reactions is ΔHrxn equal to ΔHf of the product? You do not need to look up any values to answer this

Ipatiy [6.2K]

Answer:

In none of the reactions ΔH°rxn equal to ΔH°f of the product.

Explanation:

The standard enthalpy of formation (ΔH°f) is the enthalpy change when 1 mole of a product is formed from its constituent elements in the standard states.

1/2 O₂(g) + H₂O(g) ⟶ H₂O₂(g)

ΔH°rxn is NOT equal to ΔH°f of the product because H₂O(g) is not an element but a compound.

Na⁺(g) + F⁻(g) ⟶ NaF(s)

ΔH°rxn is NOT equal to ΔH°f of the product because Na and F are not in their standard states (Na(s); F₂(g)).

K(g) + 1/2 Cl₂(g) ⟶ KCl(s)

ΔH°rxn is NOT equal to ΔH°f of the product because K is not in its standard state (K(s)).

O₂(g) + 2 N₂(g) ⟶ 2 N₂O(g)

ΔH°rxn is NOT equal to ΔH°f of the product because 2 moles of N₂O are formed.

In none of the above ΔHrxn equal to ΔHf of the product.

7 0

2 years ago

You are performing a simple distillation of roughly 50:50 liquid solution containing two components, hexane and nonane You place

kifflom [539]

Answer:

Explanation:

Refractive index is a undimensional measurement that describes how fast light travels through the material. It is used to see the liquid purity of compounds.

In this problem you have in the beginning a 50:50 solution oh hexane:nonane and realize distillation.

In distillation the collect is enriched with the most volatille substance (hexane). So you will have in the final sample more hexane than nonane.

Assuming the refractive index varies linearly with mole fraction, you will have:

1,375 → 100% hexane

1,407 → 100% nonane

1,385 → ???

molar fraction of hexane:

100 - (1,385 - 1,375) / (1,407 - 1,375) × 100 = 69 %

molar fraction of nonane:

100 - (1,407 - 1,385) / (1,407 - 1,375) × 100 = 31 %

The relation of the distillating fraction is (69:31) of (hexane:nonane)

You can see that distillation is a technique that allows the separation of a liquid mixture, for example.

I hope it helps!

6 0

2 years ago

A sample of a compound containing only carbon and oxygen decomposes and produces 24.50g of carbon and 32.59g of oxygen. what is

Fynjy0 [20]

<span>Carbon Monoxide. First, determine the relative number of moles of each element by looking up the atomic weights of carbon and oxygen Atomic weight carbon = 12.0107 Atomic weight oxygen = 15.999 Moles of Carbon = 24.50 g / 12.0107 g/mol = 2.039847802 mol Moles of Oxygen = 32.59 g / 15.999 g/mol = 2.037002313 mol Given that the number of moles of both carbon and oxygen are nearly identical, it wouldn't be unreasonable to think that the empirical formula for the compound is CO which also happens to be the formula for Carbon Monoxide.</span>

3 0

2 years ago

Read 2 more answers

The amount of energy that must be absorbed or lost to raise or lower the temperature of 1 g of liquid water by 1°C _____.

MatroZZZ [7]

Answer:

Explanation:

1 calorie = 4.184J/g×°C

This also happens to be the specific heat capacity of water, which is the amount of energy it takes to raise the temperature of 1mL of water by 1°C

6 0

2 years ago

A 3.50 g sample of rice is burned in a bomb calorimeter containing 1680 g of water. The temperature of the water increases from