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melomori [17]
3 years ago
10

A sample of gold has a mass of 38.6 grams and a volume of 2 cm3. What is the density of gold?

Chemistry
1 answer:
Mekhanik [1.2K]3 years ago
8 0
M=38.6 g
v=2 cm³

p=m/v

p=38.6/2=19.3 g/cm³

19.3 g/cm³
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Hydrogen gas and aqueous zinc chloride are produced by the reaction of aqueous hydrochloric acid and solid zinc . Write a balanc
Ymorist [56]

<em>1. Write out all the ions/elements and indicate whether they are reactants or products. </em>

<u>Reactants:</u>

Aqueous Hydrochloric Acid: HCl (H has a charge of +1 and Cl has a charge of 1-, so when an ionic bond forms they will form HCl).

Solid Zinc: Zn (since it is a solid zinc with no other forms of elements, the zinc is pure).

<u>Products:</u>

Hydrogen gas: H2 (it has to be H2 because Hydrogen is a diatomic element, and when by itself during reactions, will be H2 instead of H).

Aqueous Zinc Chloride: ZnCl2 (Zn has a charge of 2+ and Cl has a charge of 1-, so through an ionic bond, they will form ZnCl2).

<em>2. Using this information, you can then write out the unbalanced equation.</em>

HCl + Zn -> H2 + ZnCl2

<em>3. Next, indicate their states of matter and any aqueous solutions. </em>

HCl (aq) + Zn (s) -> H2 (g) + ZnCl2 (aq)

<em>4. Try different numbers until you get the same numbers of H, Cl, and Zn on both sides. </em>

2 HCl (aq) + Zn (s) -> H2 (g) + ZnCl2 (aq)

As you can see, the equation contains 2 Hydrogen atoms on both sides, 2 Chloride atoms on both sides, and 1 Zinc atom on both sides. The equation is chemically balanced.

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4 years ago
Which of the following has to remain constant to allow you to use the combined gas law flr calculations
k0ka [10]

Answer:

amount or moles of gas

Explanation:

3 0
4 years ago
What is the mass of H2O produced when 10.0 grams of H2 reacts completely with 80.0 grams of O2?
Artyom0805 [142]
H₂:

M=2g/mol
m=10g

n = m/M = 10g/2g/mol = 5mol

O₂:

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2H₂        +            O₂          ⇒          2H₂O
2mol            :       1mol        :          2mol
5mol            :       2,5mol     :          5mol
10g              :       80g           :         10g+80g=90g

B
8 0
3 years ago
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Nesterboy [21]

Explanation:

The given data is as follows.

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Relation between enthalpy and specific heat is as follows.

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Hence, putting the values into the above formula as follows.

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Thus, we can conclude that the enthalpy of reaction is -315 J.

As the value is negative so, it means that heat is releasing. Hence, the reaction is exothermic in nature.

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