42. If 8.0 grams of a sample of 60Сo existed in 1990, in which year will the remaining amount of 60Co in the sample be 0.50 gram? 1) 1995 3) 2006 2) 2000 4) 2011

Q: estion 31 of 39 Element X forms three different compounds with element Y. Information about these…

A: There are three compounds which involve element X and Y.  We have given mass of element Y per gram…

Q: When 6.00 g of sulfur are combined with 6.00 g of oxygen, 12.00 g of sulfur dioxide (SO2) are…

A: Molecular mass of sulfur = 32 g /mol, means 32 g in 1 mol.Molecular mass of O2 = 32 g / mol, means…

Q: D. Particles 5. People usually use hydrogen peroxide (Agua oxigenada) H202 to clean their wounds. If…

A: We are authorised to solve only one question at a time. Please post rest of the questions…

Q: What is the average mass, In grams, of one Zn atom? Multiple Choice O 394 x 10259 O 65.39 amu O 1661…

A: Calculation of mass of zinc:

Q: How many oxygen atoms are there in 0.825 g of AI(NO2)3 (MW Al(NO2)3 = 165.00 amu) а. 3.01 X 1021 b.…

A: Given: Mass of Al(NO2)3 = 0.825 g Molar mass of Al(NO2)3 = 165.00 amu.

Q: how many moles of zinc are present in a 79.5 gram sample of naval brass?

A: Naval Brass is a 60:40 copper zinc alloy to which about 1% of tin has been added to improve the…

Q: 6Li + N2 --> 2Li3N If 50 g Li react with 40 g N2, what is the maximum mass of lithium nitride…

A: To Solve this problem we will the given balanced chemical equation.  First we will find the limiting…

Q: How many silver atoms are contained in 1.75 moles of silver?

A: 1 mole of a substance is equal to the Avogadro number of atoms.  1 mole =6.022 x 1023 atoms.

Q: 1. When 28.0grams of CO is analyzed, it is found to contain 12.0g of carbon and 16.0g of oxygen. How…

A: Hey, since there are multiple questions posted, we will answer first question. If you want any…

Q: NaIO3 + 3 NaHSO3  → I-  + 3 SO42-  + 3 H+ + 4 Na+             5 I-  + NaIO3  + 6 H+  → 3 I2(s) + 3…

A: The two reactions given are, 1) NaIO3 + 3 NaHSO3  → I-  + 3 SO42-  + 3 H+ + 4 Na+  2) 5 I-  + NaIO3…

Q: 7. How many particles are present in 0.24 moles of carbon? 5.8 · 1023 particles 2.5 · 1024 particles

A: Mole is the unit of measurement of substances which may be atoms, molecules, ions, or electrons.

Q: 6. If 144 grams of K30 are added to 60 grams of VP, how many grams of V302 would be produced? grams…

A: Topic-- Finding  Mass of the product formed

Q: An unknown element is a mixture of 129X and 132X. the average mass of X is 130.79 amu. What is the…

A: Let x be the percentage abundance of 129X and (1-x)  be for 132X Average mass = 130.79 amu  Atomic…

Q: 14. The grams of SO2 produced will be: A) 65.70 B) 72.00 C) 81.35 D) 61.66 E) 63.59

A: SO2 molecular weight = 64. Therefore 1 mole of SO2 compound weight is equal to 64 grams ( 63.59).

Q: Magnesium exists in nature as three stable isotopes. Suppose you determine that 9.87 moles of…

A: Given - Exact masses of isotopes of Mg 25Mg = 24.9858 amu 24Mg= 23.9850 amu. 26Mg = 25.9826 amu. To…

Q: What is the mass in grams of ^16O with 15.995 u ?

A: Unified mass unit:- Theu unified mass unit (u) is a unit of atomic and molecular masses. It is…

Q: A 2.05 g sample of an unknown compound contains H, S, and O. If the compound contains 0.050 g H and…

A:

Q: What is the mass in kg of 0.49 mol CO2?

A: Number of moles of CO2 = 0.49 mol  Mass of CO2 (in kg) = ?

Q: 22 the mass in grams of 6.35 × 10 molecules of CBr4.

A: Given, molecule : CBr4 number of molecules 6.35×1022

Q: 3.50 g of a certain Compound X, known to be made of carbon, hydrogen and perhaps oxygen, and to have…

A: The empirical formula is the chemical formula of any compound that represents the proportions of…

Q: How many atoms are in 48.4 grams of Pb? Atomic weight of Pb=207.20

A: Given data is as follows: The mass of Pb = 48.4 g The atomic mass Pb = 207.20 g/mol

Q: How many grams of oxygen are combined with 94 grams of iron to make the iron(II) oxide compound?

A: Given: Oxygen is combined with iron to give iron(II) oxide. Mass of iron = 94 grams.

Q: Strontium nitrate consist of 72.8 mmol. How many pg of substance is this? The answer must be 1.54 x…

A:

Q: Determine the number of atoms of Cin 26.9 grams of C12H22O11.

A: Sucrose is a disaccharide sugar and has a molecular formula C12H22O11. The molecular mass (M) of…

Q: 18. A compound with molecular mass of 74.1 g/mol is found tO contain 64.8% carbon, 13.5% hydrogen,…

A:

Q: A cable making company produces a metal wire, with a diameter of 1.00 mm. What will be the length of…

A: Introduction: Given data: • The diameter of metal wire is 1 mm •The number of moles of metal is 1.00…

Q: Calculate the number of atoms in 2.34 grams of Ca

A: First, calculate moles of Ca: It is given by: Moles of Ca = Mass/molar mass of Ca = 2.34g/(40gmol-1)…

Q: How many oxygen atoms are there in 3.15 g of Al2(S208)3 (MW A12(S208)3 = 630.34 amu) O a. 2.41 X…

A: Given that,  Amount of Al2(S2O8)3 = 3.15 g Molar mass of Al2(S2O8)3 = 630.34 amu Moles of Al2(S2O8)3…

Q: Determine the number of atoms of C in 49.8 grams of C₁₂H₂₂O₁₁.

A:

Q: the average mass, in grams, of a single gold atom (mAumAu = 196.97 amuamu )

A: Given: Atomic mass of Au = 196.97 amu = 196.97 g/mol. Assuming 1 mole of Au atoms.

Q: 5) Find the mass of 0.02 moles of K,Cr,O,. 7'

A:

Q: Find the mass of 1 molecule of NaH in gram. а. 23.99 b. 3.98 x1023 С. 12 d. 3.98 x10-23

A: Atomic mass of sodium (Na) and hydrogen (H) atoms are as follows; Atomic mass of Na = 22.99 g/mol…

Q: Draw the products of the following reactions:

A: Given,

Q: 10.6 g of anhydrous sodium carbonate combines with 18g of water to form hydrated sodium carbonate…

A:

Q: A sample of a compound synthesized and purified in thelaboratory contains 25.0 g hafnium and 31.5 g…

A: GIVEN: Mass of Hafnium = 25.0 g Mass of tellurium=  31.5 g Mass of Hafnium present in the sample…

Q: Covert 2.34 x 10^24 molecules of N2 to moles

A:

Q: calcuya te 6011owing (a) ob molecues in 0•250 moles ob NH3 Num ber un

A: According to mole concept, 1 mole of any substance is equal to the Avogadro number (6.022 × 1022)…

Q: (a) 174Hf→ 170yb + ? chemPad XX→ b) 60 Co→ 60 Ni+? chemPad XoXº ↓ Help Greek Help Greek

A: a)  H174f→Y170b + H24e b)  C60o→N60i + e-10 c) B210i→P210o + e-10 d)  P239u→U235 + H24e

Q: 1. Calculate the number of grams in one mole of CASO7H2O ? (Atomic weight Ca-40 ,S=32 ,0=16 ,H=1 ).…

A: 1. Moles of CaSO4, 7H2 O is = 1 mol Molar mass of CaSO4 7 H2 O = [40+32+16×4+7×(2+16)]g/mol= 262…

Q: A 21.37 gram sample of an unknow element contains 0.3267 moles what is the identity of the element

A:

Q: How much does 36 moles of Carbon weigh?

A: Moles of carbon = 36 moles Weight of Carbon = ?

Q: 6) A 0.1803 g sample containing only Pb,O, and inert matter gives 0.2378 g of PbSO. Calculate the…

A: According to guidelines here we solve first question, i.e., question number 6, please ask other…

Q: 1). (NH4);PO4 + Pb(NO3)a > Pb3(POa)a +. _NH,NO3 23.98 grams of lead (IV) nitrate are needed to…

A:

Q: 16. A three (3.00) mole sample of K25 would have how many atoms of potassium? 3.61 x 1024 1.81 x…

A:

Q: Ch 5 and 6 chem 107 help. could you go step by step in some . others just need help anyway.  thank…

A: • 1 mole = 6.023 x 1023 ions/atoms/molecules1b Given,No.of atoms of Cμ = 1.48 x 1025We know,6.023 x…

Q: Calculate the mass in grams of 8.35 × 1022 molecules of CBr4

A: We have given that, No.of molecules of CBr4 = 8.35 ×1022 we know that from avogardo's law 1 mole of…

Q: How many moles of oxygen are in 1.00 moles of magnesium sulfate?  A) 2 B) 4  C) 8  D) 12

A: Formula of Magnesium Sulfate is MgSO4. We have to calculate moles of oxygen present in it.

Q: Two samples of a compound containing elements A and B are decomposed. The first sample produces 15g…

A: sample A contains 15 g sample B contains 35 g so, A:B = 15:35 = 0.428 hence they must be combined in…

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.