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Stells [14]
3 years ago
9

Taylor stirs 2 grams of salt into a cup of water. He then tries to get the salt back by evaporating the water. In this experimen

t, the mass of salt recovered would be the same as the initial mass because
A some of the salt evaporates with the water
B salt does not evaporate with water
C a chemical change occurred
D salt does not dissolve in water
Chemistry
1 answer:
34kurt3 years ago
6 0
ANSWER: B salt does not evaporate with water
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How many moles are in 124.7 g of Ba(OH)2
Alekssandra [29.7K]

Answer:

0.73 mol

Explanation:

No. of moles(n)= Given mass/molar mass.

Given mass=124.7g

Molar mass of Ba(OH)2= Molar mass of (Barium+2Oxygen+2Hydrogen)=137+32+2=171g

No. of moles= 124.7g/171g=0.73 mol

7 0
3 years ago
en un recipiente se tiene 800 g de una solución al 35% en masa de ácido sulfuroso, de la cual se evapora 80ml de agua. ¿cuál es
Alinara [238K]

The mass percent of sulfurous acid in the new solution : 38.9%

<h3>Further explanation</h3>

<em>In a container you have 800 g of a 35% by mass solution of sulfurous acid, from which 80 ml of water evaporates. What is the mass percent of sulfurous acid in the new solution? data: density of water is 1g / ml.</em>

<em />

solution 1

composition :

  • 35% acid :

\tt 0.35\times 800~g=280~g

  • water :

\tt 800-280=520~g

solution 2(new solution)

composition :

  • water

\tt 520-(80~ml\times 1~g/ml)=440~g

  • Total mass of new solution after water evaporated

\tt 280(acid)+440(water)=720~g

  • %mass of acid in a new solution

\tt \dfrac{280}{720}\times 100\%=38.9\%

5 0
3 years ago
The Lithium atom has only two energy levels. The third is empty. Therefore, we can refer to the second energy level of the lithi
Minchanka [31]

Answer:

H=1

Li=1

Na=1

Be=2

Mg=2

B=3

Al=3

C=4

Si=4

N=5

P=5

O=6

S=6

F=7

Cl=7

Ne=8

Ar=8

He=8

Explanation:

5 0
3 years ago
Which best describes the transition from gas to liquid?
Nina [5.8K]

A - its condensation and gas particles have a higher kinetic energy

8 0
3 years ago
Read 2 more answers
Find the percent of water in Zn3(PO4)2 x 7H2O
Andreas93 [3]

Answer:

24.66%

Explanation:

To find the percent of water (H2O) in the following compound: Zn3(PO4)2. 7H2O

The atomic mass of the elements are as follows:

Zn = 65g/mol

P = 31g/mol

O = 16g/mol

H = 1g/mol

Hence, molar mass of the compound is as follows:

65(3) + {31 + 16(4)} 2 + 7{1(2) + 16}

195 + 95(2) + 7(18)

195 + 190 + 126

511g/mol

Molar mass of 7H2O

= 7(18)

= 126g/mol

Hence, the percent of H2O in the compound is:

Molar Mass of 7H2O/molar mass of compound × 100

= 126/511 × 100

= 0.2466 × 100

= 24.66%

4 0
3 years ago
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