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2 years ago

Which is NOT a structure in the respiratory system?

Chemistry

2 answers:

Effectus [21]2 years ago

4 0

B. diaphragm
hope this helps!

Sonja [21]2 years ago

3 0

B diaphragm
I’m pretty sure!!:)

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Calculate by (a)% weight and (b) %mole each of the elements present in sugar

Musya8 [376]

Explanation:

Molecular mass of sugar = $C_{12}H_{22}O_{11}$ : = 432 g/mol

Atomic mass of carbon atom = 12 g/mol

Atomic mass of hydrogen atom = 1 g/mol

Atomic mass of oxygen atom = 16 g/mol

a) Percentage of an element in a compound:

$\frac{\text{Number of atoms of element}\times \text{Atomic mass of element}}{\text{molecular mass of compound}}\times 100$

Percentage of carbon by weight in $C_{12}H_{22}O_{11}$ :

$\frac{12\times 12 g/mol}{342 g/mol}\times 100=42.10\%$

Percentage of hydrogen by weight in $C_{12}H_{22}O_{11}$ :

$\frac{22\times 1g/mol}{342 g/mol}\times 100=6.43\%$

Percentage of oxygen by weight in $C_{12}H_{22}O_{11}$ :

$\frac{11\times 16g/mol}{342 g/mol}\times 100=51.46\%$

b) Percentage of mole each of the elements present in sugar:

= $\frac{\text{Moles of atoms of an element}}{\text{total moles of all types of atoms}}\times 100$

In mole of sugar we have 12 moles of carbon atom , 22 moles of hydrogen atoms and 11 moles of oxygen atoms.

Percentage of carbon by mole in $C_{12}H_{22}O_{11}$ :

$\frac{12 mol}{45 mol}\times 100=26.66\%$

Percentage of hydrogen by mole in $C_{12}H_{22}O_{11}$ :

$\frac{22 mol}{45 mol}\times 100=48.88\%$

Percentage of oxygen by mole in $C_{12}H_{22}O_{11}$ :

$\frac{11 mol}{45 mol}\times 100=24.44\%$

7 0

3 years ago

Which statement about the self-ionization of water is correct?

ASHA 777 [7]

Answer: Two water molecules interact to form a hydronium ion and a hydroxide ion.

Explanation:

5 0

2 years ago

Will give brainliest and 20 points if you help!

sweet-ann [11.9K]

Answer:

135 kPa

Explanation:

4 0

2 years ago

Nitrates are _____.

horrorfan [7]

Answer:

Nitrates are oxidising agents

3 0

2 years ago

Read 2 more answers

10. The density of aluminum is 2.7 g/cm². A 27g piece of aluminum will have<br> what volume?

kotegsom [21]

27g x 1cm^2/2.7g = answer in cm^2
Grams cancel out

3 0

2 years ago