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3 years ago

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Chemistry

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faust18 [17]3 years ago

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Answer:

ty I have got them have a good day or night

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Explain why you can not use a physical reaction to separate elements that are chemically bonded together

Rainbow [258]

Their atoms are too tightly bonded to each other for them to be separated by a physical reaction

3 0

3 years ago

2K + 2HBr → 2 KBr + H2

Inessa [10]

Answer:

$\large \boxed{\text{0.0503 g}}$

Explanation:

The limiting reactant is the reactant that gives the smaller amount of product.

Assemble all the data in one place, with molar masses above the formulas and masses below them.

M_r: 39.10 80.41 2.016

2K + 2HBr ⟶ 2KBr + H₂

m/g: 5.5 4.04

a) Limiting reactant

(i) Calculate the moles of each reactant

$\text{Moles of K} = \text{5.5 g} \times \dfrac{\text{1 mol}}{\text{31.10 g}} = \text{0.141 mol K}\\\\\text{Moles of HBr} = \text{4.04 g} \times \dfrac{\text{1 mol}}{\text{80.91 g}} = \text{0.049 93 mol HBr}$

(ii) Calculate the moles of H₂ we can obtain from each reactant.

From K:

The molar ratio of H₂:K is 1:2.

$\text{Moles of H}_{2} = \text{0.141 mol K} \times \dfrac{\text{1 mol H}_{2}}{\text{1 mol K}} = \text{0.0703 mol H}_{2}$

From HBr:

The molar ratio of H₂:HBr is 3:2.

$\text{Moles of H}_{2} = \text{0.049.93 mol HBr } \times \dfrac{\text{1 mol H}_{2}}{\text{1 mol HBr}} = \text{0.024 97 mol H}_{2}$

(iii) Identify the limiting reactant

HBr is the limiting reactant because it gives the smaller amount of NH₃.

b) Excess reactant

The excess reactant is K.

c) Mass of H₂

$\text{Mass of H}_{2} = \text{0.024 97 mol H}_{2} \times \dfrac{\text{2.016 g H}_{2}}{\text{1 mol H}_{2}} = \textbf{0.0503 g H}_{2}\\ \text{The mass of hydrogen is $\large \boxed{\textbf{0.0503 g}}$ }$

3 0

3 years ago

Select the answer from the drop-down, ranging from true or false.

Llana [10]

Answer:

False, False, True, True, False, True

Explanation:

Mixtures have components that are always in fixed ratios. FALSE. The ratio of components in a mixture is variable

Compounds can only be separated physically. FALSE. Compounds can only be separated chemically.
The components of a mixture keep their unique properties. TRUE.
Mixtures can be physically separated. TRUE.
Mixtures are pure substances. FALSE. Mixtures are formed by a mixture of 2 or more pure substances, not bonded chemically.
Compounds are pure substances. TRUE.

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3 years ago

The atomic number of oxygen is 8 which indicates that there are 8

Zinaida [17]

Answer:

Protons

Explanation:

3 0

3 years ago

Please hurry this is due tomorrow morning

Llana [10]

Answer: G Atom 1 and Atom 4.. hope this helps and good luck!

3 0

3 years ago

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