4 years ago

What’s the molar mass of Mg(NO3)2

Chemistry

1 answer:

amid [387]4 years ago

8 0

Answer: 148.33 g/mol

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Write the formula for a complex formed between zn2 and nh3, with a coordination number of 3.

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Zn²⁺ + 3NH₃ = [Zn(NH₃)₃]²⁺ threeamminezinc cation

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4. Write the chemical equation for the reaction that occurs when baking soda (NaHCO3) is

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Answer: B. C and A.

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PLZ HELP For the reaction: 2NO2(g) → N2O4(l),

Furkat [3]

Answer: $\Delta H_{rxn}=-20kJ/mol-(+66kJ/mol)$

Explanation:

Heat of reaction or enthalpy change is the energy released or absorbed during the course of the reaction.

It is calculated by subtracting the enthalpy of reactants from the enthalpy of products.

$\Delta H=H_{products}-H_{reactants}$

$\Delta H$ = enthalpy change = ?

$H_{products}$ = enthalpy of products

$H_{reactants}$ = enthalpy of reactants

For the given reaction :

$2NO_2(g)\rightarrow N_2O_4(l)$

$\Delta H=H_{N_2O_4}-2\times H_{NO_2}$

$\Delta H=-20kJ/mol-(+66kJ/mol)$

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3 years ago

Calculate the percent composition (out of 100) by weight of potassium in potassium carbonate decahydrate.

Darya [45]

Answer:

12.26%

Explanation:

MM K = 39.1 g/mol

MM K2CO3 . 10H2O = 2x39.1 + 12.01 + 3 x 15.99 + 10 x 18.02= 318.38 g/mol

% by weight = (MM K/MM K2CO3.10H2O ) x 100= (39.1/318.8) x 100=12.26 %

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