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2 years ago

How many molecules is 7.22 mole H2O

Chemistry

2 answers:

Vinil7 [7]2 years ago

6 0

Answer:

no H2O molecules are produced:)

Explanation:

rjkz [21]2 years ago

3 0

Answer: 18 g of water occupies one mole and one mole contains Avagadro’s no. of molecules = 6.023*10^23 molecules .

Explanation:question says 72 g of water . 72 g of water occupies 4 moles.

So the no. of molecules in 72 g of water has 4*(6.023*10^23) molecules .

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Vitek1552 [10]

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3 years ago

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sertanlavr [38]

Explanation:

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2 years ago

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3 years ago

How much ice at a temperature of -17.5 ∘C must be dropped into the water so that the final temperature of the system will be 31.

Tanya [424]

Answer:

An insulated beaker with negligible mass contains liquid water with a mass of 0.205kg and a temperature of 79.9 °C How much ice at a temperature of −17.5 °C must be dropped into the water so that the final temperature of the system will be 31.0 °C? Take the specific heat for liquid water to be 4190J/Kg.K, the specific heat for ice to be 2100J/Kg.K, and the heat of fusion for water to be 334000J/kg.

The answer to the above question is

Therefore 0.1133 kg ice at a temperature of -17.5 ∘C must be dropped into the water so that the final temperature of the system will be 31.0 °C

Explanation:

To solve this we proceed by finding the heat reaquired to raise the temperature of the water to 31.0 C from 79.9 C then we use tht to calculate for the mass of ice as follows

ΔH = m×c×ΔT

= 0.205×4190×(79.9 -31.0) = 42002.655 J

Therefore fore the ice, we have

Total heat = mi×L + mi×ci×ΔTi = mi×334000 + mi × 2100 × (0 -−17.5) = 42002.655 J

370750×mi = 42002.655 J

or mi = 0.1133 kg

Therefore 0.1133 kg ice at a temperature of -17.5 ∘C must be dropped into the water so that the final temperature of the system will be 31.0 °C

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2 years ago

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Alexeev081 [22]

Answer:

The lowest region of the atmosphere

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3 years ago