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lbvjy [14]
3 years ago
9

Please help ! its urgent!!

Chemistry
1 answer:
ArbitrLikvidat [17]3 years ago
5 0

Answer:

D

Explanation:

Respiration is the process by which you get energy from food. So energy in food is converted to a form that can be used by the body

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The periodic table contains information about which types of matter?
stiv31 [10]
B. elements
It's called the periodic table (of the elements)
7 0
3 years ago
Magnesium has three stable isotopes. The most commonly occurring isotope, 24 Mg, has an isotopic mass of 23.985 u and makes up 7
aleksandr82 [10.1K]

Answer:

Average atomic mass = 24.3051 amu

Explanation:

Average Atomic Mass = (Mass of Isotope 1 x Fractional Abundance of Isotope 1) + (Mass of Isotope 2 x Fractional Abundance of Isotope 2) + ......

For 24 Mg

Mass = 23.985 amu

Fractional Abundance = 0.7899

Mass * Fractional Abundance = 18.9458

For 25 Mg

Mass = 24.986 amu

Fractional Abundance = 0.10

Mass * Fractional Abundance = 2.4986

For  26 Mg

Mass = 25.983

Fractional Abundance = 0.1101

Mass * Fractional Abundance = 2.8607

Average atomic mass = 24 Mg + 25 Mg + 26 Mg

Average atomic mass = 18.9458 + 2.4986 + 2.8607

Average atomic mass = 24.3051 amu

4 0
3 years ago
How many atoms are in 24.6 moles of carbon?
alina1380 [7]

Answer: There are 148.1412\times 10^{23} atoms of carbon in the given moles.

Explanation:

We are given 24.6 moles of carbon and we need to find the number of atoms.

According to mole concept:

1 mole of an element contains 6.022\times 10^{23} number of atoms.

So, 24.6 moles of carbon will contain 24.6\times 6.022\times 10^{23}=148.1412\times 10^{23} atoms.

Hence, there are 148.1412\times 10^{23} atoms of carbon in the 24.6 moles of carbon.

8 0
3 years ago
Calculate the number of moles in 9 g of water​
tangare [24]

Answer:

= 0.5 moles of water

formular \: mass \: of \: water \:  = (2 \times 1)  + 16  = 18 \\ 18g \: of \: water \: are \: weighed \: by \: 1 \: mole. \\ 9g \: will \: be \: weighed \: by \:  \frac{9 \times 1}{18}  \\  =  \frac{9}{18} moles \\  = 0.5 \: moles \: of \: water

7 0
3 years ago
Read 2 more answers
Calculate the percentage by mass of oxygen in Al2(SO4)3 (Al=27, S=32,O= 16) PLEASE SHOW FULL WORKING​
White raven [17]

Answer:

There is 61.538% oxygen in Al2(SO4)3.

Explanation:

Wt Of oxygen in the compound = 12*16 = 192 amu.

Total Wt. Of the compound = 2*12+3*32+12*16 = 312 amu.

Thus, percent of oxygen = Wt of oxygen/total Wt. Of compound *100

= 192/312 * 100=61.538 %

6 0
3 years ago
Read 2 more answers
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