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4 years ago

- 爷爷和奶奶的对话,对故事情节的发展有什么作用

Chemistry

2 answers:

nika2105 [10]4 years ago

8 0

Answer:爷爷和奶奶的对话, 是从哪里来的. 告诉我, 我先帮你. 是从一书里么.你呢不能给我发一个图片.谢谢.

g100num [7]4 years ago

6 0

Answer:

I think this is under the wrong category.

Explanation:

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How much energy is released when 65.8 g of water freezes

Delvig [45]

The amount of energy released is calculated by the product of heat of fusion and mass. The formula of amount energy released is given by: $q= L\times m$ (1)

Here,

q is amount of energy released L is heat of fusion ( $334 J/g$ ) m is mass of water Put all the given values in equation (1)

$q= 334 J/g \times 65.8 g$

$q= 21977.2 Joules$ ≅ $21977 Joules$

$q= 21977 Joules$

Thus, amount of energy released is $21977 Joules$

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3 years ago

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calculate the molarity of MgCl2 in the following solution: 5.34 g of MgCl2 is dissolved and diluted to 214 mL of solution.

anyanavicka [17]

$\quad\hookrightarrow\quad \sf {0.262M }$

<h3>Ⲋⲟⳑⳙⲧⳕⲟⲛ :</h3>

Molarity is used to measure the concentration of a solution , so it is also as molar concentration. It is denoted as M or Mol/L

We are given that :

Weight of $\sf MgCl_{2}$ = 5.34g
Volume of solution = 214 ml , or 0.214 L

The molar mass of magnesium chloride ( $\sf MgCl_{2}$ ) is 95.21 g / mol

We can calculate the molarity of the solution by dividing the number of moles of solute by volume of solvent in liter ,i.e:

$\quad\longrightarrow\quad \sf {M = \dfrac{n}{V} }$ ‎ㅤ‎ㅤ‎ㅤ⸻( 1 )

Where,

M = molarity
n = number of moles
V = Volume

We can calculate the number of moles by dividing the actual mass by its molar mass ,i.e:

$\quad\longrightarrow\quad \sf { n = \dfrac{w}{m}}$ ‎ㅤ‎ㅤ‎ㅤ‎⸻ ( 2 )

Where,

n = number of moles
m = molar mass
w = actual mass

Therefore,

$\implies\quad \tt {n =\dfrac{w}{m} }$

$\implies\quad \tt { n =\dfrac{5.35\: g}{95.21\: g /mol}}$

$\implies\quad{\pmb{ \tt {n = 0.056 mol}} }$

Putting the values in equation ( 1 ):

$\implies\quad \tt {M=\dfrac{n}{V} }$

$\implies\quad \tt { M =\dfrac{0.056\:mol}{0.214\:L}}$

$\implies\quad\underline{\pmb{ \tt { M = 0.262 \:M }}}$

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2 years ago

How many moles of potassium chloride and oxygen can be produced from 100.0g of potassium chlorate? The balanced equation is: 2 K

natka813 [3]

100.0 g KClO₃ × 1 mol KClO₃/122.55 g KClO₃ × 2 mols KCl/2 mols KClO₃= 0.8160 mols of KCl

100.0 g KClO₃ × 1 mol KClO₃/122.55 g KClO₃ × 3 mols O₂/ 2 mols KClO₃= 1.224 mols of O₂

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122.55 g is molar mass of potassium chlorate

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Without constants you would not know which variable affected the

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Two independent variables could change at the same time, and you would not know which variable affected the dependent variable

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3 years ago

- 爷爷和奶奶的对话,对故事情节的发展有什么作用​

- 爷爷和奶奶的对话,对故事情节的发展有什么作用