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3 years ago

Which temperature is coldest??

Chemistry

1 answer:

svp [43]3 years ago

8 0

The lowest temperature is the coldest.

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Study the chemical formula of the following substance.

Julli [10]

Answer:

it is the formulae of glucose

It is a compound made of carbon,oxygen,hydrogen

6 0

3 years ago

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Compute the molar enthalpy of combustion of glucose (C6 H12O6 ): C6 H12O6 (s) + 6 O2 (g) → 6 CO2 (g) + 6 H2 O (g) Given that com

lana66690 [7]

Answer:

The molar enthalpy of combustion of glucose is -2819.3 kJ/mol

Explanation:

Step 1: Data given

Mass of glucose = 0.305 grams

Combustion of 0.305 grams causes a raise of 6.30 °C

Calorimeter has a heat capacity of 755 J/°C

Molar mass of glucose = 180.2 g/mol

Step 2: The balanced equation

C6H12O6 (s) + 6O2 (g) → 6CO2 (g) + 6H2O (g)

Step 3:

ΔH = (m * C * ΔT + c(calorimeter) * ΔT)

with m = mass of the solutin = 0.305 grams

with C = heat capacity of water = 4.184 J/g°C

with ΔT = the change in temperature = 6.30 °C

with c(calorimeter) = 755 J/°C

ΔH = 0.305 * 4.184 *6.30 + 755 * 6.30 = 4764.5 J ( negative because it's exothermic)

Step 4: Calculate moles of glucose

Moles glucose = mass glucose / Molar mass glucose

Moles glucose = 0.305 grams / 180.2 g/mol

Moles glucose = 0.00169 moles

Step 5: Calculate molar enthalpy

Molar enthalpy = -4764.5 J / 0.00169 moles

Molar enthalpy = - 2819254.2 J/moles = -2819.3 kJ/moles

The molar enthalpy of combustion of glucose is -2819.3 kJ/mol

5 0

3 years ago

Define aqua regia short answer boreeeeeee

larisa [96]

Answer:

Aqua regia is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regia is a yellow-orange fuming liquid, so named by alchemists because it can dissolve the noble metals gold and platinum, though not all metals.

Explanation:

3 0

3 years ago

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Calculate the number of oxygen atoms in 1.58g of kmnO4

zvonat [6]

Answer: i think it's 4 oxygen atoms

Explanation:

so sorry if i'm wrong

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3 years ago

As the temperature of a medium increases, the speed of the sound wave

Irina-Kira [14]

Answer : As the temperature of a medium increases, the speed of the sound wave increases because the particles bump into each other more often.

Explanation :

The dependency of the speed of the sound wave and the temperature of the medium is :

$v=\sqrt{\gamma\ R\ T}$

Where

$\gamma$ = ratio of specific heat

R is gas constant

T is the temperature

The speed of the wave is directly proportional to the temperature. As the temperature of a medium increase, the speed of the sound increase. The particles start vibrating faster. Hence, they bump into each other.

Hence, the correct option is (A).

8 0

3 years ago

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