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4 years ago

Write a chemical equation that describes the dissolving of solid magnesium nitrate, Mg(NO3)2, in water.

2 answers:

7 0

<span>Given below is the chemical equation that describes the dissolving of solid magnesium nitrate, Mg(NO3)2, in water Mg(NO3)2(aq) â†’ Mg2+(aq) + 2NO3-(aq)</span>

Leviafan [203]4 years ago

5 0

Answer:

Your answer is Mg(NO3)2, in water Mg(NO3)2(aq) â†’ Mg2+(aq) + 2NO3-(aq)

Explanation:

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A car is traveling with an initial velocity of 15 m/s when the driver decides to go faster by accelerating at 5 m/s2 for 10 seco

Ilia_Sergeevich [38]

Answer: Time needed: 2.5 s

Distance covered: 31.3 m

Explanation:

I'll start with the distance covered while decelerating. Since you know that the initial speed of the car is 15.0 m/s, and that its final speed must by 10.0 m/s, you can use the known acceleration to determine the distance covered by

on one side of the equation and solve by plugging your values

To get the time needed to reach this speed, i.e. 10.0 m/s, you can use the following equation

Explanation:

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3 years ago

the atomic number tells you the number of _______ in one atom of an element. It also tells you the number of ______ in a neutral

uysha [10]

Answer:

Protons, electrons, same in that order is the answer.

Explanation:

this has to do with the periodic table information.

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3 years ago

A student estimated a mass to be 250 g but, upon carefully measuring it, found the value to be 240 g. What is the percent error

attashe74 [19]

Im sure that the answer is C, correct me if im wrong.

7 0

3 years ago

Determine the heat of reaction (ΔHrxn) for the reaction of calcium carbonate (CaCO3) with HCl to produce CO2 by using heat of fo

andrey2020 [161]

Answer: The heat of reaction (ΔHrxn) for the reaction is -164.9kJ

Explanation:

The given balanced chemical reaction is,

$CaCO_3(s)+2HCl(g)\rightarrow CaCl_2(s)+CO_2(g)+H_2O(g)$

To calculate the enthalpy of reaction $(\Delta H^o)$ .

$\Delta H^o=H_f_{product}-H_f_{reactant}$

$\Delta H^o=[n_{CaCl_2}\times \Delta H_f^0_{(CaCl_2)}+n_{CO_2}\times \Delta H_f^0_{(CO_2)}+n_{H_2O}\times \Delta H_f^0_{(H_2O)}]-[n_{CaCO_3}\times \Delta H_f^0_{(CaCO_3)+n_{HCl}\times \Delta H_f^0_{(HCl)}]$

where,

$\Delta H^o_f_{(CaCO_3(s))}=-1206.9kJ/mol\\\Delta H^o_f_{(HCl(g))}=-92.30kJ/mol\\\Delta H^o_f_{(CaCl_2(s))}=-877.1kJ/mol\\\Delta H^o_f_{(H_2O(g))}=-285.8kJ/mol\\\Delta H^o_f_{(CO_2(g))}=-393.51kJ/mol$

Putting values in above equation, we get:

$\Delta H^o_{rxn}=[(1\times -877.1)+(1\times -393.51)+(1\times -285.8)]-[(1\times -1206.9)+(2\times -92.30)]=-164.9kJ$

Therefore the heat of reaction (ΔHrxn) for the reaction is -164.9kJ

6 0

3 years ago

What does percent composition tell you about a molecule

geniusboy [140]

Percent composition of a molecule is found through the molecular formula (Mass of each element found in a single mole of the molecule ÷ total molar mass of the molecule). This tells you how much of a specific element makes up the molecule.

Also be aware that 2 molecules can have the same % composition but different formulas.

5 0

3 years ago

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