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Paul [167]
2 years ago
8

Identify the substances that are likely to dissociate in water. Check all that apply

Chemistry
1 answer:
almond37 [142]2 years ago
8 0
The hydroxide give it away
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What is the MOLAR heat of combustion of methane(CH₄) if 64.00g of methane are burned to heat 75.0 ml of water from 25.00°C to 95
melamori03 [73]

Answer:

-5.51 kJ/mol

Explanation:

Step 1: Calculate the heat required to heat the water.

We use the following expression.

Q = c \times m \times \Delta T

where,

  • c: specific heat capacity
  • m: mass
  • ΔT: change in the temperature

The average density of water is 1 g/mL, so 75.0 mL ≅ 75.0 g.

Q = 4.184J/g.\°C \times 75.0g \times (95.00\°C - 25.00\°C) = 2.20 \times 10^{3} J = 2.20 kJ

Step 2: Calculate the heat released by the methane

According to the law of conservation of energy, the sum of the heat released by the combustion of methane (Qc) and the heat absorbed by the water (Qw) is zero

Qc + Qw = 0

Qc = -Qw = -22.0 kJ

Step 3: Calculate the molar heat of combustion of methane.

The molar mass of methane is 16.04 g/mol. We use this data to find the molar heat of combustion of methane, considering that 22.0 kJ are released by the combustion of 64.00 g of methane.

\frac{-22.0kJ}{64.00g} \times \frac{16.04g}{mol} = -5.51 kJ/mol

8 0
3 years ago
0.65743 In scientific notation
Goryan [66]
202827.0000 is the answer I think idrk
6 0
2 years ago
Property of a substance
Scrat [10]

There are many properties to substances.

I'll list some examples below:

  • Mass
  • Volume
  • Density
  • Conductivity
  • Malleability
  • Boiling point
  • Melting point
  • Heat capacity

Hope this helps! :3

8 0
2 years ago
Which is a NOT a freshwater source on Earth?
cluponka [151]

Answer:

B the atmosphere it's not on earth and I'm pretty sure  the atmosphere doesn't have water in

Explanation:

7 0
2 years ago
Which of the following are products of the reaction listed? Zn + 2HCI
Alexus [3.1K]

Answer:

uh A.)? [ZnCI2+H2]? /////////

5 0
3 years ago
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