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2 years ago

How can I express the composition of a solution?

Chemistry

1 answer:

murzikaleks [220]2 years ago

4 0

Answer:

It can be expressed in several ways: molarity (moles of solute per liter of solution); mole fraction, the ratio of the number of moles of solute to the total number of moles of substances present; mass percentage, the ratio of the mass of the solute to the mass of the solution times 100; parts per thousand (ppt), grams ...

Explanation:

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In a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is

vova2212 [387]

Answer:

4. the heat of reaction

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2 years ago

A 20.0 g piece of a metal is heated and place into a calorimeter containing 250.0 g of water initially at 25.0 oC. The final tem

BartSMP [9]

Answer:

$Q_{metal} = -6799\,J$

Explanation:

By the First Law of Thermodynamics, the piece of metal and water reaches thermal equilibrium when water receives heat from the piece of metal. Then:

$Q_{metal} = - Q_{w}$

$Q_{metal} = m_{w} \cdot c_{p,w}\cdot (T_{1}-T_{2})$

$Q_{metal} = (250\,g)\cdot \left(4.184\,\frac{J}{g\cdot ^{\textdegree}C} \right)\cdot (25\,^{\textdegree}C - 31.5\,^{\textdegree}C)$

$Q_{metal} = -6799\,J$

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3 years ago

Read 2 more answers

What is the mass in grams of 358 mL of ethylene glycol?

frez [133]

The density of ethylene glycol is: D = 1.11 g/mL
D = m / V
and V = 358 mL
m = D * V
m = 1.11 g/mL * 358 mL
m = 397.38 g
Answer:
Mass is 397.38 g.

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3 years ago

What is the empirical formula for propene (C3H6)?<br> C2H4<br> C4H8<br> C3H6<br> CH2

melamori03 [73]

Answer:

C3H6

Explanation:

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2 years ago

Read 2 more answers

7944/0.024 = _______ give the answer to the correct number of significant figures?

In-s [12.5K]

Answer:

330,000

Explanation:

Since there are only 2 significant figures in 0.024 ( and 0.024 is the number with the least number of significant numbers), the answer is 330,000, not 331,000.

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3 years ago