how many atoms in the average human?
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In summary, for a typical human of 70 kg, there are almost 7*1027 atoms (that's a 7 followed by 27 zeros!) Another way of saying this is "seven billion billion billion." Of this, almost 2/3 is hydrogen, 1/4 is oxygen, and about 1/10 is carbon. These three atoms add up to 99% of the total!
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Nitrogen – 2.4kg The four most abundant elements in the human body – hydrogen, oxygen, carbon and nitrogen – account for more than 99 per cent of the atoms inside you. They are found throughout your body, mostly as water but also as components of biomolecules such as proteins, fats, DNA and carbohydrates.
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How many chromosomes do people have? In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46. Twenty-two of these pairs, called autosomes, look the same in both males and females. The 23rd pair, the sex chromosomes, differ between males and females.
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Scientists estimate the volume of blood in a human to be approximately 7 percent of body weight. An average adult with a weight of 150 to 180 pounds will contain approximately 1.2 to 1.5 gallons (4.7 to 5.5 liters) of blood.
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Expert Answer The human body consists of millions of cells; each cell (liver, intestinal etc) contains 23 pairs of chromosomes except for germ cells (egg and sperm) and red blood cells. Thus a total of 46 chromosomes are present in human cells.
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In summary, for a typical human of 70 kg, there are almost 7*10^27 atoms (that's a 7 followed by 27 zeros!) Another way of saying this is "seven billion billion billion." Of this, almost 2/3 is hydrogen , 1/4 is oxygen , and about 1/10 is carbon .
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In other words, 1 mole of atoms is 6.02×1023 atoms. 1 mole of molecules is 6.02×1023 molecules.
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One mole of any element has a mass in grams that is equal to its atomic number, and has exactly 6.02 x 1023 atoms - however because the atoms of each element have different sizes and weights, then the volume that each one occupies is different.
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Calculating Average Atomic Mass The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope). Average atomic mass = f1M1 + f2M2 +…
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Each of these quantities contains 6.022×1023 atoms of that particular element. The units for molar mass are grams per mole or g/molg/mol.
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It is thus no wonder that 99% of the atoms in the human body come from six elements: Hydrogen (62.9%), oxygen (almost 24%), carbon (nearly 12%), nitrogen (nearly 0.6%), calcium (0.24%) and phosphorus (0.14%).
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Almost 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium.
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By mass, about 96 percent of our bodies are made of four key elements: oxygen (65 percent), carbon (18.5 percent), hydrogen (9.5 percent) and nitrogen (3.3 percent).
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Today, a group of physicists reveal the answer. They say there are 6.02214084(18) × 10^23 atoms in a single crystal of silicon weighing about a kilogram.
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Let's see – it is estimated that an adult human has about 7 billion billion billion atoms (that's a 7 followed by 27 zeros!!). Your hands take up about one half of a percent of your total body weight – so one hand takes up about a quarter of a percent, or 0.025th of your total body weight.
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In terms of the human body, 46 (the number of people in our first group of volunteers, whose pictures and comments are here) is a truly magical number – it's the total number of chromosomes that are found in each and every human cell*. 46 chromosomes in a human call, arranged in 23 pairs.
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The typical human body cell contains 46 chromosomes.