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gladu [14]
3 years ago
5

Which statement is true?

Chemistry
2 answers:
marin [14]3 years ago
8 0

your answer is c because rocks are NOT ALL THE TIME MADE WITH JUST ONE MINERAL

mihalych1998 [28]3 years ago
3 0
B. Most rocks are composed of single mineral
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A solution is made by dissolving 9.74 g of sodium sulfate in water to a final volume of 165 mL of solution. What is the weight/w
MatroZZZ [7]

Answer: The weight/weight % or percent by mass of the solute is 5.41 %.

Explanation:

Mass of the sodium sulfate,w = 9.74 g

Volume of the water = 165 mL

Density of the water = 1 g/mL

Density=1 g/mL=\frac{\text{Mass of water}}{\text{Volume of water}}

Mass of the water =1 g/mL\times 165 mL=165 g

Mass of the solution, W:

Mass of solute + Mass of solvent =9.47 g + 165 g=174.47 g

w/w\%=\frac{w\times 100}{W}=\frac{9.45 g\times 100}{174.47 g}=5.41 \%

The weight/weight % or percent by mass of the solute is 5.41 %.


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if an element [x] contains 8 protons, 8 neutrons and 8 electrons, the atomic number of the element is ?
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Answer:

8

Explanation:

The atomic number refers to the number which identifies the element, which is the proton number.

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