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3 years ago

Balance the equation

Chemistry

1 answer:

kap26 [50]3 years ago

3 0

Answer: Balanced chemical equation will be :

$5SiO_2+2CaC_2\rightarrow 5Si+2CaO+4CO_2$

Explanation:

$SiO_2+CaC_2\rightarrow Si+CaO+CO_2$ (Unbalanced)

A balanced chemical reaction follows the Law of Conservation of Mass. which states in a chemical reaction mass can neither be created nor be destroyed. In other words total mass of the products is equal to the total mass of reactants.

Balanced chemical equation will be :

$5SiO_2+2CaC_2\rightarrow 5Si+2CaO+4CO_2$

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An excess of mg(s) is added to 100.ml of 0.400 m hcl. at 0c and 1 atm pressure, what volume of h 2 (g) can be obtained?

ra1l [238]

The balanced equation for the reaction between Mg and HCl is as follows
Mg + 2HCl --> MgCl₂ + H₂
stoichiometry of HCl to H₂ is 2:1

number of HCl moles reacted - 0.400 mol/L x 0.100 L = 0.04 mol of HCl
since Mg is in excess HCl is the limiting reactant
number of H₂ moles formed - 0.04/2 = 0.02 mol of H₂

we can use ideal gas law equation to find the volume of H₂
PV = nRT
where
P - pressure - 1 atm x 101 325 Pa/atm = 101 325 Pa
V - volume
n - number of moles - 0.02 mol
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature in Kelvin - 0 °C + 273 = 273 K
substituting these values in the equation

101 325 Pa x V = 0.02 mol x 8.314 Jmol⁻¹K⁻¹ x 273 K
V = 448 x 10⁻⁶ m³
V = 448 mL
therefore answer is
c. 448 mL

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How is the process of respiration and photosynthesis represent the "Law of Conservation of Mass"?

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The law of conservation of mass states energy can’t be created or destroyed, but can be interconverted. During those processes, you are not creating new molecules, but each molecule undergoes a mechanism to be converted to another.

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2.67 grams of butane (C4H10) is combusted in a bomb calorimeter. The temperature increases from 25.68 C to 36.2C. What is the ch

slavikrds [6]

The internal energy : 1310.43 kJ/mol

<h3>Further explanation</h3>

Internal energy (ΔE) can be formulated for Calorimeter :

$\tt \Delta E=C\times.\Delta t$

C= the heat capacity of the calorimeter

Δt=36.2-25.68=10.52°C

$\tt \Delta E=5.73 kJ/^oC\times 10.52^oC=60.2796~kJ$

mol butane(MW=58,12 g/mol)

$\tt \dfrac{2.67}{58,12 }=0.046$

the internal energy (ΔE) in KJ/mol

$\tt \dfrac{60.2796}{0.046}=1310.43~kJ/mol$

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Read 2 more answers

The density of lithium is 0. 546 g/cm3. what volume is occupied by 3. 66 x 10 23 atoms of lithium?

s344n2d4d5 [400]

The volume occupied by 3.66 x $10^{23}$ atoms of lithium is 7.73 $cm^3$

<h3>What is Density?</h3>

The density of a substance is defined as the mass of the substance per unit volume. It is often denoted by the symbol ρ

The density of a substance is given by,

$\rho = \frac{m}{V}$

The mass of a substance is the measure of the amount of matter present in it. It is generally measured in grams (g) or kilograms (kg).

The volume of a substance is defined as the amount of 3D space occupied by it.

<h3>What is Mole Concept?</h3>

It is a concept which uses mole as a unit to measure the number of atoms, molecules or ions.

A mole is defined as the amount of substance which has the same number of elementary particles as there are atoms in 12 grams of $\ce{^{12}C}$

1 mole = Avogadro's number = 6.022 x $10^{23\\$ atoms

<h3>Steps to find out the volume</h3>

Molar Mass of Lithium = 6.94 g/mol

1 mole of Lithium has 6.022 x $10^{23}$ atoms

3.66 x $10^{23}$ atoms of lithium has molar mass = $\frac{6.94 g}{6.022\times10^{23} } \times 3.66 \times 10^{23}$

$m = 4.218 g$

Substitute in density formula,

$\rho = \frac{m}{V}$

$V = \frac{m}{\rho}$

$=\frac{4.218g}{0.546g/cm^3}$

= 7.73 $cm^3\\$

Therefore, 3.66 x $10^{23}$ atoms of lithium occupies 7.73 $cm^3\\$ of volume.

Learn more about the mole concept:

brainly.com/question/1427235

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2 years ago