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Ann [662]
3 years ago
9

Someone please help me with this????

Chemistry
1 answer:
tensa zangetsu [6.8K]3 years ago
6 0

Answer:

D po ayan po ang sagot ko salamat po

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Dalton incorporated the law of conservation of mass into his atomic theory by asserting that
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Why Basalt and gabbro are denser than granite and<br> obsidian?
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Answer:

What do you think causes some rock types to have higher densities than others? (Assuming there are no air pockets in the rock, the types of minerals will determine the density. Granite contains lots of quartz and feldspar - both fairly light minerals, whereas basalt and gabbro are made of heavier minerals.)

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Which of the following is not considered an aspect of environmental health?
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The one that isn't considered an aspect of environmental health such as smog<span />
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A compound is found to consist of 34.5% sodium, 16.4% boron, and 48.6% oxygen. What is the empirical formula?
NARA [144]

Answer: The empirical formula is NaBO_2

Explanation:

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given:

Mass of Na= 34.5 g

Mass of B= 16.4 g

Mass of O = 48.6 g

Step 1 : convert given masses into moles.

Moles of Na =\frac{\text{ given mass of Na}}{\text{ molar mass of Na}}= \frac{34.5g}{23g/mole}=1.5moles

Moles of B =\frac{\text{ given mass of B}}{\text{ molar mass of B}}= \frac{16.4g}{11g/mole}=1.5moles

Moles of O =\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{48.6g}{16g/mole}=3moles

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For Na = \frac{1.5}{1.5}=1

For B = \frac{1.5}{1.5}=1

For O =\frac{3}{1.5}=2

The ratio of Na: B: O= 1: 1: 2

Hence the empirical formula is NaBO_2

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3 years ago
Sandra reacts 3.345 g of zinc with hydrochloric acid. She obtained 3.956 g of zinc chloride. Calculate the percent composition o
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