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: Tin, element 50 on the periodic table, has 10 stable isotopes. 117^Sn makes up 7.687% of naturally…

A: Using the formula moles of Sn117 is calculated as,

Q: Zn+ 2Au(CN)2 → Zn(CN)4+ 2Au What mass of gold would you expect to recover from 2.50x105 gr

A: Zn+ 2Au(CN)2 → Zn(CN)4+ 2Au2 mol  Au(CN)2 produces  2 mol Autherefore,2 g ×Au(CN)2 produces = 2 g…

Q: P.S. 6. A miner was digging up some ore (rock). The ore contains 84% lead(II) sulfide by mass. How…

A:

Q: When kerosene is burned with oxygen, the products are carbon dioxide and water. If you produce 72…

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Q: If 2 moles of water decomposes, the products that will form are 2 moles of hydrogen gas and one mole…

A: Given, Moles of water decomposed = 2 moles.

Q: Chemical analyses conducted by the first Mars Rover robotic vehicle in its 1997 mission collected…

A:

Q: We experimented on various elements: Mossy Zinc, Aluminum Turnings, Copper Turnings, Activated…

A:

Q: A sample of iron weighing 15.0 g was heated with potassium chlorate (KCIO3) in an evacuated…

A:

Q: Pesto-Bishop, which helps provide soothing relief for an upset stomach, contains 300 mg bismuth…

A: 1 mg = 1000 g. The molecular formula of C21H15Bi3O2 contains three molecules of bismuth…

Q: Identify an element that would have similar properties as magnesium (Mg). Explain your choice and…

A: The element that has the similar properties like magnesium is -

Q: Two elements, R and Q, combine to form two binary compounds A and B. In the compound A, 10.50 g of R…

A: The law of multiple proportions states that if two elements combine with each other to form more…

Q: At first, it seemed like the poisoned Russian agent might have ingested thallium in the form of…

A: the minimum amount of thallium to kill an average adult= 8*102 mg concentration= 0.45m conc = no of…

Q: Let's start by finding the location on the periodic table for the atoms for substances that conduct…

A: In general ionic compounds formed between metal and non metal conducts electricity when dissolved in…

Q: A 4.450 g sample of hydrated lithium iodide, LiI·xH2O, is dried in an oven. When the anhydrous salt…

A: The water of crystallization is having a fixed number of water molecules present in one formula unit…

Q: If 4 Kg of Gallium (Ga) is reacted with 11 Kg of Nitrogen (N). what mass of GaN will be formed? The…

A: We have given 4 Kg = 4000 g of Gallium (Ga) which is reacted with 11 Kg = 11000 g of Nitrogen (N2).…

Q: Matter is neither created nor destroyed in a chemical reaction. Thus, the mass of the products of a…

A:

Q: . An iron supplement is used to treat anaemia and 50 mg of Fe2+ is required per tablet. If the iron…

A: The question is based on quantitative estimation. we have to calculate how much compound is required…

Q: 2CUO (s) + C(s) → 2Cu(s)+ CO, ( If the student starts with 5.00 g of Carbon (C) how many grams of…

A: Given, Mass of C = 5.00 g  Mass of Cu = ?

Q: Suppose you have a bucket of sand containing 1.5 billion grains of sand ( 1.5×109 grains). Most of…

A: Total number of grains = 1.5 ×109 grains Concentration of brown sand is = 4.0 %  The number of brown…

Q: A 5.05 g sample of quartz (SiO2) contains 2.36 g of silicon. What are the percentages of silicon and…

A: The mass of sample of quartz is 5.05 g. The mass of silicon in quartz is 2.36 g.

Q: d) Which of the following substances can be considered chemically pure? • Brass ● ● Seawater Air…

A: Given 5 substances • Brass , • Seawater ,  • Air , • Apple juice  ,    • A bar of 24-karat gold We…

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: A nutrition table lists apples with a potassium content of 4600 mg/pound. Assume an average apple is…

A: According to the given data, Mass of an average apple = 75.0 g Because, 454 g = 1 poundMass of an…

Q: Consider Molecule X, which is found in all living cells. This single-strand nucleic acid folds into…

A: The name of x is RNA (Ribonucleic acid) Explanation given below with attached file.Explanation:

Q: Part F The compound iron chloride can exist with either iron(II) ions or iron(IIl) ions. Conduct…

A:

Q: Part B Magnesium makes up 2.10 % by mass of the Earth's crust. How many grams of magnesium are…

A: Mass percent :-  The mass of a component in grams present in 100 grams mixture of all components is…

Q: A 10.5 g sample of lithium is reacted with 18.5 g of fluorine to form lithium fluoride: Li + F2 →…

A: Given, A 10.5 g sample of lithium is reacted with 18.5 g of fluorine to form lithium fluoride:Li +…

Q: A 12 year old male patient has been prescribed Gaviscon suspension 5 mL four times a day. Gaviscon…

A: Given,           prescribed Gaviscon suspension= 5 mL        four time a day        moles of Na+ in…

Q: A chemist is testing for lead content in water samples taken downstream from a battery manufacturing…

A: We have to predict whether water is safe to drink or not.

Q: 4. Two engineers are serving as trainees in a laboratory of a pharmaceutical company. One of their…

A: Given: % of C in the sample = 59.0 % % of H in the sample = 5.0 % % of N in the sample = 22.9 % % of…

Q: Lactic acid, found in sour milk, dill pickles, and sauerkraut, has the functional groups of both an…

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Q: Chemistry of Mars NASA's 1997 mission to Mars included a small robot, the Sojourner, that analyzed…

A: Given : There are 3 naturally occurring isotopes of MgO. And the abundance data of isotopes are,

Q: A student used a piece of aluminum that had a mass of 2.583 grams, and treated according to the same…

A: Given:Mass of Al= 2.583 gramsChemical equation:2 Al(s) + 2 KOH(aq) + 4 H2SO4(aq) + 22 H2O(l) → 2 KAl…

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.