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DaniilM [7]
1 year ago
7

What is the molecular weight of water? (numbers only, to nearest 0.1)

Chemistry
1 answer:
yulyashka [42]1 year ago
4 0

The molecular weight of a substance is calculated by adding the molecular mass of each element present in the molecule multiplied by the number of times each element is in the molecule. For greater clarity, we can organize a table that allows us to do the calculations. We have the following structure for water:

The molecular weight of water will be:

2.01568 + 15.999 = 18.0468=18.0 g/mol

Answer= 18.0

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Kp for the following reaction is 0.16 at 25 degree C. 2 NOBr(g) 2 NO(g) Br_2(g) The enthalpy change for the reaction at standard
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Answer:

Explanation:

Given that:

2 NOBr_{(g)} \iff 2 NO_{(g)} + Br_{2(g)}

From above:

K_p = 0.16 = \dfrac{(P_{NO})^2 (P_{Br})}{(P_{NOBr})^2}

To predict the effect of the addition of Br₂(g);

The addition of Br₂(g) will favor the equilibrium to shift to the left i.e. formation of NOBr

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NItrogen in air reacts at high temperature to form NO2 according to the reaction:
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Answer:

The correct answer is option E.

Explanation:

Structures for the reactants and products are given in an aimage ;

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\Delta H=[2 mol\times \Delta H_{f,NO_2}]-[1 mol\times \Delta H_{f,N_2}-2 mol\times \Delta H_{f,O_2}]

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The enthalpy of the given reaction is 15.86 kcal.

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