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3 years ago

When nickel metal is added to silver nitrate in solution, silver metal and nickel (II) nitrate are

Chemistry

1 answer:

ludmilkaskok [199]3 years ago

7 0

Answer:

Mass of silver metal = 424 g

Explanation:

Data Given

Reactants = Nickle (Ni) metal and Silver nitrate (AgNO₃)

product = Ni(NO₃)₂ and Silver metal (Ag)

mass of nickle = 115 g

mass of silver = ?

Solution:

First write a balanced reaction

Ni + 2AgNO₃ ----------> 2Ag + Ni(NO₃)₂

Now Look for the number of moles of Nickle and Silver meta

Ni + 2AgNO₃ ----------> 2Ag + Ni(NO₃)₂

1 mol 2 mol

So,

1 mole of nickle combine with silver nitrate and produce 2 moles of silver metal

Now Convert moles to mass for which we have to molar masses of Nickle and Silver metal

Molar mass of Nickle = 58.6 g/mol

Molar mass of Silver = 108 g/mol

Ni + 2AgNO₃ ----------> 2Ag + Ni(NO₃)₂

1 mol (58.6 g/mol) 2 mol (108 g/mol)

58.6 g 216 g

So,

58.6 g of Nickle metal produces 216 grams of silver metal.

Now

What mass of silver is produced from 115 g of Ni

Apply unity formula

58.6 g of Ni ≅ 216 g of Ag

115 g of Ni ≅ X g of Ag

By doing cross multiplication

Mass of Ag = 216 g x 115 g / 58.6 g

Mass of Ag = 424 g

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I want to know the steps.

Artyom0805 [142]

The answer for the following problem is described below.

Therefore the standard enthalpy of combustion is -2800 kJ

Explanation:

Given:

enthalpy of combustion of glucose(Δ $H_{f}$ of $C_{6}H_{12} O_{6}$ ) =-1275.0

enthalpy of combustion of oxygen(Δ $H_{f}$ of $O_{2}$ ) = zero

enthalpy of combustion of carbon dioxide(Δ $H_{f}$ of $CO_{2}$ ) = -393.5

enthalpy of combustion of water(Δ $H_{f}$ of $H_{2} O$ ) = -285.8

To solve :

standard enthalpy of combustion

We know;

Δ $H_{f}$ = ∈Δ $H_{f}$ (products) - ∈Δ $H_{f}$ (reactants)

$C_{6}H_{12} O_{6}$ (s) +6 $O_{2}$ (g) → 6 $CO_{2}$ (g)+ 6 $H_{2} O$ (l)

Δ $H_{f}$ = [6 (-393.5) + 6(-285.8)] - [6 (0) + (-1275)]

Δ $H_{f}$ = [6 (-393.5) + 6(-285.8)] - [0 - 1275]

Δ $H_{f}$ = 6 (-393.5) + 6(-285.8) - 0 + 1275

Δ $H_{f}$ = -2361 - 1714 - 0 + 1275

Δ $H_{f}$ =-2800 kJ

Therefore the standard enthalpy of combustion is -2800 kJ

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3 years ago

Which statement summarizes the difference between mass and weight?

alexgriva [62]

Answer:

Mass is the amount of matter in an object.

Weight is how much an object weighs.

Hope this helps!

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4 years ago

Describe examples of failed experiments that produced valuable information

Nataliya [291]

Hello Norgepr, examples of failed experiments that produced valuable information can be the mage via BoingBoing There have been ample stories of human children being raised by other species and eventually becoming more like that animal than an actual human. If the process could go one way, Winthrop Kellogg was sure that it could also go the other, particularly if the animal involved was one of our closest genetic cousins. In 1931, Kellogg received a grant for his experiment and the timing couldn’t be better –his wife just had a baby boy, David. This would give them the unique opportunity to raise a baby chimp, named Gua, right along side a human baby. It didn’t take long for the babes to bond and become best friends. Kellogg and his wife took impeccable notes on their two “children” noting their physical changes, emotions and how they scored on small intelligence tests. The chimp scored notably higher on the intelligence tests due the fact that the species matures faster than human babies. Gua picked up quite a few human behaviors, such as walking upright and eating with a spoon, but she failed to learn how to speak and learn simple repetition games, like patty cake. Her emotions were also much less predictable and inclined to change at the drop of a hat. Unfortunately, the experiment really started to go wrong when little David started to become more chimplike than Gua became humanlike. He only learned a few simple words and often took to making chimp howls when he wanted something. After only nine months, the Kelloggs gave up on Gua, concerned that David would fail to grow up like a normal human child. In the years since this project, plenty of people have adopted chimps as babies, proving beyond a doubt that the animals can never act completely human –even if they are adorable in overalls.

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3 years ago

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PolarNik [594]

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4 years ago

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andrew-mc [135]

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