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Mama L [17]
3 years ago
10

The better we measure the better things ____

Chemistry
1 answer:
Vitek1552 [10]3 years ago
8 0

Don't look in the comments

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How many grams of chlorine gas can be produced from the decomposition of 73.4
ser-zykov [4K]
1) first, we have to convert the grams to moles of AuCl3 using the molar mass of the molecule. 

molar mass of AuCl3= 197 + (35.5 x 3)= 303.5 g/mol

73.4 g (1 mol AuCl3/ 303.5 g)= 0.242 moles

2) now. let's convert moles of AuCl3 to moles of chlorine gas (Cl2) using the mole-mole ratio

0.242 mol AuCl3 (3 mol Cl2/ 2 mol AuCl3)= 0.363 mol Cl2

3) finally, we convert moles to grams using the molar mass of Cl2.

molar mass of Cl2 = 35.5 x 2= 71.0 g/mol

0.363 mol Cl2 ( 71.0 g/ 1 mol)= 25.8 grams
6 0
3 years ago
Una solución contiene 25.10 ml de H2SO4 (densidad de 1.34 g/ml). Calcular la molaridad, moralidad, normalidad, fracción molar de
aliina [53]

Answer:

Molaridad: 0.80 mol/L

Molalidad: 0.80 mol/kg

Xst: 0.014

Xsv: 0.986

N: 1.6 Eq/L

Explanation:

Volumen de soluto: 25.10 mL (ácido sulfúrico)

Volumen de solvente: 426 mL (agua)

Sabemos que la densidad del acido es 1.34 g/mL, por lo que podemos calcular así la masa de ácido en solución:

1.34 g/mL = masa / volumen

1.34 g/mL . 25.10 mL = 33.6 g

Con la masa molar, calculamos moles: 33.6 g . 1 mol / 98g = 0.343 moles

Molaridad: (moles de 1 soluto en 1 L de solución)

Convertimos mL a L, asumimos que el volumen de solvente es el volumen total: 426 mL . 1L / 1000 mL = 0.426 L

0.343 mol / 0.426 L =  0.80 M

No existe moralidad en Quimica, asumo que es molalilad

La molalidad señala moles de soluto en 1 Kg de solvente. Necesitamos la masa de solvente que calculamos a traves de la densidad del agua:

1 g/ mL = masa / volumen

1 g/mL . 426 mL = 426 g de solvente

Convertimos a kg → 426 g . 1 kg / 1000 g = 0.426 kg

0.343 mol / 0.426 kg = 0.80 m

Para las fracciones molares sumamos los moles de cada compuesto

Moles de soluto + moles de solvente = Moles totales

Xst = moles de soluto / moles totales

Xsv = moles de solvente / moles totales

Los moles de solvente son: 426 g . 1mol / 18g = 23.67 moles

0.343 mol st + 23.67 mol sv = 24.013 moles

Xst = 0.343 / 24.013 = 0.014

Xsv = 23.67 / 24.013 = 0.986

La normalidad señala la cantidad de equivalentes de soluto, contenidas en 1L de solución:

Se calculan los Eq como (masa molar / N° de H⁺ u OH⁻ si es base)

Eq acido sulfurico = 98 g / 2 = 49 Eq

(Dividido 2 porque son 2 H⁺)

Eq acido sulfurico en 33.6 g = 33.6 g / 49 → 0.686 Eq

N = 0.686 Eq / 0.426 L → 1.61 N

Si la cantidad de H⁺ para un acido o de OH⁻ para una base es 1:

Molaridad = Normalidad

Si la cantidad es el doble podemos decir:

2 . M = N

Si verificamos, 2 . 0.8 M = 1.6 N

8 0
3 years ago
Calcium carbide reacts with water to produce acetylene gas according to the following equation: CaC2(s) + 2H2O(l)C2H2(g) + Ca(OH
gtnhenbr [62]

Answer: The number of moles of CaC_2 reacted was 0.229

Explanation:

According to ideal gas equation:

PV=nRT

P = pressure of gas = Total pressure - vapor pressure of water = (749 - 23.8) mm Hg= 725.2 mm Hg = 0.954 atm    (760mmHg= 1atm)

V = Volume of gas = 5.87 L

n = number of moles = ?

R = gas constant =0.0821Latm/Kmol

T =temperature =25^0C=(25+273)K=298K

n=\frac{PV}{RT}

n=\frac{0.954atm\times 5.87L}{0.0821 L atm/K mol\times 298K}=0.229moles

CaC_2(s)+2H_2O(l)\rightarrow C_2H_2(g)+Ca(OH)_2(aq)

According to stoichiometry:

1 mole of C_2H_2 is produced by = 1 mole of CaC_2

Thus 0.229 moles of C_2H_2 is produced by = \frac{1}{1}\times 0.229=0.229 moles of CaC_2

Thus number of moles of CaC_2 reacted was 0.229

5 0
3 years ago
A ball rolls down a hill. It starts with velocity of 2 ms. After 2 seconds, the ball has a velocity of 12 ms. What is the accele
trapecia [35]

Answer:

5 ms2

Explanation:

8 0
3 years ago
Read 2 more answers
What is acid rain and why is it a concern?
Vikki [24]

Answer:

acid rain is  a type of mixture that has a chemical substance that harms people, and can lead to possibly death.

Explanation:

8 0
4 years ago
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