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lina2011 [118]
3 years ago
14

Which organ is a part of circulatory system? a. brain b. heart c. lungs d. stomach

Chemistry
2 answers:
Mumz [18]3 years ago
7 0
B is the answer   4 that        :)                           
statuscvo [17]3 years ago
3 0
The brain is part of the neurological/nervous system, the lungs are part of the pulmonary system, and the stomach is the key component of the digestive system. This leaves the answe "B", the heart, as the answer because it is the pump in every mammalian body that drives blood flow leaving the heart through arteries and returning deoxygenated through the veins.
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What is the percent of hydrogen by mass in CH4O?<br> (H:1.00 amu, C: 12.01 amu, O: 16.00 amu)
cricket20 [7]

The mass percent of hydrogen in CH₄O is 12.5%.

<h3>What is the mass percent?</h3>

Mass percent is the mass of the element divided by the mass of the compound or solute.

  • Step 1: Calculate the mass of the compound.

mCH₄O = 1 mC + 4 mH + 1 mO = 1 (12.01 amu) + 4 (1.00 amu) + 1 (16.00 amu) = 32.01 amu

  • Step 2: Calculate the mass of hydrogen in the compound.

mH in mCH₄O = 4 mH = 4 (1.00 amu) = 4.00 amu

  • Step 3: Calculate the mass percent of hydrogen in the compound.

%H = (mH in mCH₄O / mCH₄O) × 100%

%H = 4.00 amu / 32.01 amu × 100% = 12.5%

The mass percent of hydrogen in CH₄O is 12.5%.

Learn more about mass percent here:brainly.com/question/4336659

3 0
2 years ago
Need help with the 1st one
lutik1710 [3]

If I’m right this should be the answer

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