1. A typical multivitamin tablet can contain 2.00 mg of vitamin B2 (riboflavin), and the RDA is 0.0030 g/day. How many such tablets should a person take each day to get the proper amount of this vitamin, assuming that he gets none from any other sources?   2. The RDA for the trace element selenium is 0.000070 g/day. Express this dose in  mg/day.

Q: 106. Carbon-12 contains 6 protons and 6 neutrons. The radius of the nucleus is approximately 2.7 fm,…

A:

Q: A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar…

A: Given: Determine average atomic mass and complete the measurement.The average atomic mass, also…

Q: Based on the law of conservation of mass, how many grams of hydrogen gas, x, are formed by the…

A: Given, 66.0 g zinc + 72.9 g hydrochloric acid produces 136.3 g zinc chloride+ x g hydrogen gas. We…

Q: Lithium carbonate, Li2CO3, contains 18.8 % lithium and is used in the treatment of mental illnesses…

A: Given : mass percent of lithium in Li2CO3 = 18.8 %. And mass of Li2CO3 sample = 1.48 g

Q: Specify the number of protons and electrons in each of the following ions. A) Se^2−, needed for…

A: To specify the number of protons and electrons we will use the following concept . Since we know…

Q: A box of clear plastic wrap for household use is polyethylene,{ CH with density = 0.910 Mg/m'. A box…

A: From area and thickness we can calculate the volume and the mass of the compound . From here we can…

Q: How many grams of Pb2+ are presented in 2.65 grams of lead (II) nitrate?  How many grams of lead…

A: a) Pb2+ are presented in 2.65 grams of lead (II) nitrate = 1.66 gram b) grams of lead (II) nitrate…

Q: The radius of a rhodium atom is 134 pm. How many rhodium atoms would have to be laid side by side to…

A: GivenRadius of rhodium = 134pm Distance= 1.70mmMass of single uranium atom = 4.70×10^-22g

Q: Please don't use hend raiting and step by step solutions

A: Number of electron and proton in iron is 26 .So atomic number of iron is 26 .Symbol of iron is 26…

Q: per liter. The atomic radius of neon is 69 pm. You may want to reference (Pages 20 - 24) Section E.8…

A: Given    Temperature  =0°C    Number of atoms=2.69×1022 atoms per litre    Atomic  radius of…

Q: An object is put into a graduated cylinder with 50.0 mL of water.  The two together take up a volume…

A: We need to calculate the density using the given data and then compare it with given density of all…

Q: bottle. The bottle contains 3.78 L of ethanol. The bottle contains 2 What is the density of ethanol…

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Q: When methane is burned with oxygen the products are carbon dioxide and water. If you produce 36…

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Q: When methane is burned with oxygen, the products are carbon dioxide and water. If you produce 18…

A: CH4 + 2O2 ------> CO2 + 2H2O Mol. Mass lf CH4 = 16g Mol. Mass of O2 = 32g Mol. Mass of CO2 = 44g…

Q: Analyze the following reaction by looking at the electron configurations given below each box. Put a…

A: Answer: For an element its atomic number is always equal to the number of protons present in its…

Q: There are 1.699 x 1022 atoms in 1.000 g of chlorine.  Assume that chlorine atoms are spheres of…

A: Number of atoms in 1 g chlorine = 1.699 × 1022 atoms Number of atoms in 0.5 g chlorine = 0.5 × 1.699…

Q: The halogens are all in the same group. What is the pattern in reactivity as you go down group 7A?…

A: To  Does the reactivity increase or decrease, as we go down from F to CL to Br to I? How is this…

Q: Determine the number of atoms in 1.85×10^-3L of Mercury. [The density of mercury is 13.5g/mL.]

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Q: K(s) Ca(s)

A: A question based on electrochemical series, which is to be accomplished.

Q: The radius (r) of a silver atom is 160 picometers (1 pm = 1 × 10–12 m). Estimate the thickness of…

A: First convert the unit of radius from picometers to centimeters; 1 pm=10-10cm160 pm=160×10-10cm

Q: 10. Platinum has six isotopes: 1⁹0Pt, 192Pt, 194Pt, 195Pt, 196Pt, and 198Pt. The natural abundances…

A: We need to find the Average atomic mass of platinum from the given data of atomic mass of Isotopes…

Q: Rank the masses of the elements from lightest to heaviest. To rank items as equivalent, overlap…

A: Atomic masses of the elements: B : 11 u Cr: 52 u Li: 7 u

Q: Write a balanced equation for the following by inserting the correct coefficients (if a coefficient…

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Q: Two experiments were conducted: 1.2.750 g of copper(II) oxide, CuO₂, was reduced by heating at high…

A: Answer:Two elements always combined in the fixed ratio of their masses to form a compound…

Q: Bulk platinum cost about $1158 dollars per ounce (28.35 g = 1 ounce) how much would it cost to…

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Q: When 5.00 g of sulfur is combined with 5.00 g of oxygen, 10.00 g of sulfur dioxide (SO2) is formed.…

A: Chemical reactions are those reactions which undergo any chemical change. Chemical reaction is…

Q: The waters of the oceans contain many elements in trace amounts. Rubidium, for example, is present…

A: Note :  Since you have posted multiple questions, we are entitled to answer the first only. Please…

Q: A 2.540 g sample of an oxide of tin was heated in the air until the mass of the sample no longer…

A: Mass of tin (IV) oxide is 2.842 gmolar mass of tin (IV) oxide = 150.71 g/molatomic mass of tin =…

Q: Two different compounds are obtained by combining nitrogen with oxygen. The first compound results…

A: First we need to calculate the mass ratio of O to N in first and second compound by using the mass…

Q: Anhydrous CuSO4 is converted to CuSO4・xH2O to absorb water from certain liquids. What is the value…

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Q: a. The space station uses prepackaged 25.0 kg cartridges of lithium oxide. How much water does each…

A: a. Lithium oxide is used to remove water from air according to the following equation.…

Q: Which observation illustrates the law of conservation of mass? A.)When 3 g of carbon reacts with 8…

A: Law of conservation of mass states that matter cannot be created nor to be destroyed in a chemical…

Q: Three samples (A, B, and C) of pure substance composed ofsodium, sulfur, and oxygen were isolated…

A: A question based on elemental analysis, which is to be accomplished.

Q: Calculate the amount of material remaining for each of the following substances.

A:

Q: Use the References to access important values if needed for this question. 1A 8A H 2A 3A 4A SA 6A 7A…

A: Isoelectronic species are the species having same electrons. Electron of Cl- = (17+1)= 18e-…

Q: Octane (C8H18), a component of gasoline, reacts with oxygen to form carbon dioxide and water. Write…

A: Octane C8H18 on  reaction with oxygen O2 produces carbon dioxideCO2 and waterH2O.The balanced…

Q: determine the number of carbon atoms in a one-carat diamond.

A:

Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.