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3 years ago

Element X consist of two isotopes with masses of 62.9 and 64.9. The relative atomic mass of the element is 63.6. What is th

Chemistry

1 answer:

koban [17]3 years ago

4 0

Answer:

it is 50%

Explanation:

62.9x50=3145

64.9x50=3245

3245+3145=6390

6390/100=63.9

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What is the difference between mechanical weathering and chemical weathering?? (extra points for whoever answers it first.)

muminat

Answer: Mechanical weathering breaks rocks into smaller pieces without changing their composition.

Chemical weathering breaks down rocks by forming new minerals that are stable at the Earth's surface.

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2 years ago

Which of the following is released during cellular respiration?: a. oxygen b. air c. energy d. lactic acid

mezya [45]

Explanation:

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3 years ago

Which of the three minerals contain calcium carbonate? A. salt B. chalk C. talcum

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Answer:

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Explanation:

I hope that this was helpful! (✿◠‿◠)

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2 years ago

(a) Calculate the density of a 374.5-g sample of copper if it has a volume of 41.8 cm3. (b) A student needs 15.0 g of ethanol fo

o-na [289]

Answer:

For a: The density of the sample of copper is $8.96g/cm^3$

For b: The volume of ethanol needed is 19.0 mL

For c: The mass of mercury is 340. grams

Explanation:

To calculate density of a substance, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$ ......(1)

For a:

Mass of copper = 374.5 g

Volume of copper = $41.8cm^3$

Putting values in equation 1, we get:

$\text{Density of copper}=\frac{374.5g}{41.8cm^3}\\\\\text{Density of copper}=8.96g/cm^3$

Hence, the density of the sample of copper is $8.96g/cm^3$

For b:

Mass of ethanol = 15.0 g

Density of ethanol = 0.789 g/mL

Putting values in equation 1, we get:

$0.789g/mL=\frac{15.0g}{\text{Volume of ethanol}}\\\\\text{Volume of ethanol}=\frac{15.0g}{0.789g/mL}=19.0mL$

Hence, the volume of ethanol needed is 19.0 mL

For c:

Volume of mercury = 25.0 mL

Density of mercury = 13.6 g/mL

Putting values in equation 1, we get:

$13.6g/mL=\frac{\text{Mass of mercury}}{25.0mL}\\\\\text{Mass of mercury}=(13.6g/mL\times 25.0mL)=340.g$

Hence, the mass of mercury is 340. grams

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3 years ago

Do females take longer to eliminate alcohol than male, even though they might be the same weight ?

natita [175]

The answer to this question is false

6 0

3 years ago

Read 2 more answers