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expeople1 [14]
2 years ago
12

Balance the following reaction:

Chemistry
1 answer:
NeX [460]2 years ago
8 0

Answer:

3 Ca(OH)2 + 2 K3PO4 ---> Ca3(PO4)2 + 6 KOH

Explanation:

Just balance each atom on both sides.

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125 grams of HCl are used. Zn(s) + 2HCl(aq) = ZnCl2(aq) + H2(g). What is the percent yield if 1.2 moles of hydrogen are actually
Blababa [14]

Answer:

70%

Explanation:

To find the percent yield, you need to (1) convert grams HCl to moles (via molar mass from periodic table), then (2) convert moles HCl to moles H₂ (via mole-to-mole ratio from equation), then (3) calculate the percent yield H₂ (via percent yield equation).

Zn (s) + 2 HCl (aq) --> ZnCl₂ (aq) + 1 H₂ (g)

Molar Mass (HCl): 1.008 g/mole + 35.45 g/mole
Molar Mass (HCl) = 36.458 g/mole

125 g HCl         1 mole HCl         1 mole H₂
---------------  x  ------------------  x  ------------------  = 1.7 moles H₂
                         36.458 g           2 moles HCl

(actual yield / theoretical yield) x 100% = percent yield

theoretical/calculated yield = 1.7 moles H₂
actual yield = 1.2 moles H₂

(1.2 moles H₂ / 1.7 moles H₂) x 100% = 71%

Therefore, the best percent yield of hydrogen produced is 70%.

8 0
2 years ago
The uses of sodium phosphate include clarifying crude sugar, manufacturing paper, removing boiler scale, and washing concrete. W
garri49 [273]

2.4  ×    10⁻² is the pH of a solution

What is the short definition of pH?

  • The pH scale determines how acidic or basic water is. The range is 0 to 14, with 7 representing neutrality. Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7.
  • In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.

Equation representing the i onization of Na₃PO₄ is as fallow

              Na₃PO₄          →                 PO₄³⁻    +  3Na⁺

Concentration of Na₃PO₄ = \frac{26.9 * \frac{1 mol}{164 g} }{1 L} = 0.164 M

Since 1 mol of Na₃PO₄ forms 1 mol of  PO₄³⁻  [  PO₄³⁻  ] = [ Na₃PO₄ ] = 0.164 M

Equation representing the  i onization of HPO²⁻₄ is as fallow

 HPO²⁻₄          →         PO₄³⁻  +    H⁺

Acidionization constant Ka₃ of   HPO²⁻₄  = 4. 17 ×  10⁻¹³

Baseionization constant  Kb₃ of  PO₄³⁻ = Ka₃/ Kb₃

                              = 1 .0  ×  10⁻¹⁴/  4. 17 ×  10⁻¹³  = 2.4  ×    10⁻²

Learn more about pH

brainly.com/question/15289741

#SPJ4

4 0
2 years ago
How do lipids differ from carbohydrates? they are formed from different basic elements
grin007 [14]
Lipids are insoluble in water and they produce twice as more energy as carbohydrates.
5 0
3 years ago
What is the mass, in grams, of 7.20×1020 molecules of caffeine, c8h10n4o2?
pickupchik [31]
To determine the mass, you need to know the molecular weight of the c8h10n4o2 . The molecular weight of <span>c8h10n4o2 would be: 8*12 + 10*1 + 4*14 + 2*16= 194g/mol.
To convert the number of molecules into moles, you need to divide it with 6.02 * 10^23. The calculation of the mass of </span>c8h10n4o2 would be: 
(7.20×10^20 molecules)  /(6.02 * 10^23 molecule/mol)  * 194g/mol= 232 * 10^-3 grams= 0.232 grams
3 0
3 years ago
Read 2 more answers
What is the first step in the scientific method? A. form a hypothesis B. illustrate the process C. observe and ask questions D.
Tom [10]
The answer would be C) Observe and ask questions because if we do process of elimination we see that drawing conclusions is NOT the first step, forming a hypothesis and illustrating the process is part of the method, but NOT the first step.
3 0
3 years ago
Read 2 more answers
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