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faltersainse [42]
4 years ago
8

Convert 15.78 g of H2O2 to mols. Convert 15.3 mols Au to g

Chemistry
1 answer:
iren2701 [21]4 years ago
8 0

Answer:

.46 moles H2O2

3,014 grams Au

Explanation:

H2O2:

15.78g (1 mol/34g) = .46 moles H2O2

Au:

15.3mol (197g/mol) = 3,014 grams Au

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Answer:

a. chemical change

Explanation:

A chemical change can cause an odor, however a physical change cannot, and the use of thermal energy will only make an object colder, not give it an odor.

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3 years ago
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A backpacker collects snow at 0°C, and places it in a cooking pot on a camp stove. It takes 643 kJ of heat energy to melt the sn
frutty [35]

Answer:

mass (m) of the snow that the backpacker collected= 0.855 kg

Explanation:

Given that:

Q = 643 kJ = 643000 J

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number of mole of water H2O = \frac{mass (m)}{18}

c = 4.18 J/g⋅K

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Since there is a phase change from solid to liquid; then :

Q = Q_s + Q_l

ΔH = \frac{q}{mol}

However without the given mass; we substitute \frac{m}{18} for the number of moles; so:

Q = \delta H * \frac{m}{18} + m*c * \delta T

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m = 855 g

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mass (m) of the snow that the backpacker collected= 0.855 kg

8 0
3 years ago
When writing equations the mass on the left of the arrow must
sp2606 [1]

Answer:

When writing equation the mass on left side of equation must be equal to the mass on right side. True

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The chemical reactions always follow the law of conservation of mass.

Law of conservation of mass:

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Explanation:

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For example:

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6 0
3 years ago
Enzymes are proteins that speed up chemical reactions in the body.
Ket [755]

Answer:

C.) They act as catalysts.

8 0
2 years ago
Heterocyclic aromatic compounds undergo electrophilic aromatic substitution in a similar fashion to that undergone by benzene wi
Readme [11.4K]

Answer:

See explanation

Explanation:

When we talk about electrophilic substitution, we are talking about a substitution reaction in which the attacking agent is an electrophile. The electrophile attacks an electron rich area of a compound during the reaction.

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