• ### How many moles are in 22.6g of silver nitrate? A sample of silver chromate has a mass of 25.8 grams. How many moles are in this sample?

Refer to the Periodic Table for the Relative Atomic masses. Silver nitrate (AgNO3) Ag x 1 = 108 x 1 = 108 N x 1 = 14 x 1 = 14 O x 3 = 16 x 3 = 48 108 + 14 + 38 = 160 (The Mr (Relative Molecular Masses og Silver Nitrate) Then using the equation moles = mass(g) / Mr moles(AgNO3) = 22.5 / 160 = 0.140625 moles For Silver Chromate (Ag2CrO4) ... show more
Refer to the Periodic Table for the Relative Atomic masses. Silver nitrate (AgNO3) Ag x 1 = 108 x 1 = 108 N x 1 = 14 x 1 = 14 O x 3 = 16 x 3 = 48 108 + 14 + 38 = 160 (The Mr (Relative Molecular Masses og Silver Nitrate) Then using the equation moles = mass(g) / Mr moles(AgNO3) = 22.5 / 160 = 0.140625 moles For Silver Chromate (Ag2CrO4) Again from the Periodic Table fid the Mr Ag x 2 = 108 x 2 = 216 Cr x 1 = 52 x 1 = 52 O x 4 = 16 x 4 = 64 216 + 52 + 64 = 332 moles(Ag2CrO4) = 25.8 / 332 = 0.07590 .. moles
1 answer · Chemistry · 3 hours ago
• ### 5.) What is the mass of 4.35 x 10^-2 mol of zinc chloride? 6.) What would be the molar mass of 2.55 mol of potassium permangante?

Mr (ZnCl2) = 65 + (2 x 35.5) = 136 moles = mass(g) / Mr mass(ZnCl2) = 0.0435 x 136 5.916 g Mr(KMnO4) = 39 + 55 + (4 x 16) = 158 2.55 moles = mass)g) / 158 mass(g) = 2.55 x 158 = 395 g However, the Molar Mass is the mass of one mole 1 mole = mass (g) / 158 mass(g) = 158 g ( The molar Mass) .
Mr (ZnCl2) = 65 + (2 x 35.5) = 136 moles = mass(g) / Mr mass(ZnCl2) = 0.0435 x 136 5.916 g Mr(KMnO4) = 39 + 55 + (4 x 16) = 158 2.55 moles = mass)g) / 158 mass(g) = 2.55 x 158 = 395 g However, the Molar Mass is the mass of one mole 1 mole = mass (g) / 158 mass(g) = 158 g ( The molar Mass) .
1 answer · Chemistry · 3 hours ago
• ### Is the North Pole land or frozen ocean?

Frozen Ocean
Frozen Ocean
8 answers · Earth Sciences & Geology · 16 hours ago
• ### Paul has 3/5 of a roll of speaker wire. His sister uses 1/4 of it. How much of the whole roll of speaker wire did Paul s sister use?

3/5 X 1/4 = 3/20 of the total roll .
3/5 X 1/4 = 3/20 of the total roll .
3 answers · Homework Help · 1 day ago
• ### Why do scientists use the terms mass and volume instead of amount ?

'Amount' could mean any type of 'quantity' 'Mass' is the amount of 'matter' in a given entity and is measured as a weight (lbs. / kgs/ g) 'Volume' is the amount of space a given entity occupies and is measured in (cubic feet / cubic metres(m^3) / centimetres cubed (cm^3))
'Amount' could mean any type of 'quantity' 'Mass' is the amount of 'matter' in a given entity and is measured as a weight (lbs. / kgs/ g) 'Volume' is the amount of space a given entity occupies and is measured in (cubic feet / cubic metres(m^3) / centimetres cubed (cm^3))
4 answers · Chemistry · 1 day ago
• ### Write the balanced chemical equation for the complete combustion of (C3H7OH).?

C3H7OH + (9/2)O2 = 3CO2 + 4H2O Double up 2C3H7OH + 9O2 = 6CO2 + 8H2O
C3H7OH + (9/2)O2 = 3CO2 + 4H2O Double up 2C3H7OH + 9O2 = 6CO2 + 8H2O
2 answers · Chemistry · 1 day ago
• ### For the following quadratic equations, what is the constant that should be added to both sides in order to complete the square?

To complete the square x^2 + 8x = -8 We take the coefficient of '8x' , which '8' and halve it to '4' . This value together with 'x' is put inside a 'squaring bracket. Hence (x + 4)^2 We now take the '4' , square it to 4^2 = 16 and make it a negative Hence (x + 4)^2 -16 and equate to '-8'... show more
To complete the square x^2 + 8x = -8 We take the coefficient of '8x' , which '8' and halve it to '4' . This value together with 'x' is put inside a 'squaring bracket. Hence (x + 4)^2 We now take the '4' , square it to 4^2 = 16 and make it a negative Hence (x + 4)^2 -16 and equate to '-8' Hence (x + 4)^2 - 16 = -8 Algebraically rearrange (x + 4)^2 = 8 ; ( 16 - 8 = 8) Square Root both sides x + 4 = +/-2sqrt(2) x = -4 +/- 2sqrt(2) NB for the next one '-10' becomes '-5' Squared becomes '25' . negative = '-25' For the last one '5' becomes '5/2' . Squared becomes '25/4; , negative = -25/4
6 answers · Mathematics · 1 day ago
• ### How to balance the following?

When combusting aany hydrocarbon the products are always carbon dioxide(CO2) and water (H2O) Hence C8H16 + O2 = 8CO2 + 8H2O Notice from the octene (C8H16) ; Notice, this is NOT Octane, because there are not sufficient hydrogens; there are '8' carbons, this gives 8x CO2 Similarly there are '16' hydrogens . This gives '8 x... show more
When combusting aany hydrocarbon the products are always carbon dioxide(CO2) and water (H2O) Hence C8H16 + O2 = 8CO2 + 8H2O Notice from the octene (C8H16) ; Notice, this is NOT Octane, because there are not sufficient hydrogens; there are '8' carbons, this gives 8x CO2 Similarly there are '16' hydrogens . This gives '8 x H2O' . This accounts for the '16 ' hydrogens. We then back calculate the oxygens . There are 8 x 2 = 16 in CO2 and a further '8' in water. This makes for a totel of 16 + 8 = 24 oxygens. Since we have two oxygens in each molecules of oxygen we need 2 x 12 = 24 oxygens. so the coefficient (Molar ratio) for 'O2' is '12' Hence the full equation is C8H16 + 12O2 = 8CO2 + 8H2O
2 answers · Chemistry · 1 day ago
• ### If I send email to congress what do I write?

'Dear Mr. Speaker if it is going to Congress (House of Representatives).
'Dear Mr. Speaker if it is going to Congress (House of Representatives).
2 answers · Homework Help · 1 day ago
• ### If 30.0 mL of 0.500 M KOH are needed to neutralize 10.0 mL of HCL if unknown concentration, what is molarity of the HCL?

Best answer: First write down the BALANCED reaction KOH + HCl = KCl + H2O All the molar ratios are '1' Next using the eq'n moles = [conc] x vol(mL) / 1000 mol(KOH) = 0.5 x 30.0 / 1000 = 0.0015 (Wquivalent to '1' molar ratio) mol(HCl) = 0.0015 (Also equivalent to '1' above). Hence 0.00115 = [HCl] x 10. / 1000... show more
Best answer: First write down the BALANCED reaction KOH + HCl = KCl + H2O All the molar ratios are '1' Next using the eq'n moles = [conc] x vol(mL) / 1000 mol(KOH) = 0.5 x 30.0 / 1000 = 0.0015 (Wquivalent to '1' molar ratio) mol(HCl) = 0.0015 (Also equivalent to '1' above). Hence 0.00115 = [HCl] x 10. / 1000 Algebraically rearrange [HCl] = 0.0015 x 1000 / 10 = 0.15 M (= 0.15 mol dm^-3)
2 answers · Chemistry · 2 days ago
• ### How would I write an electron configuration of a stable ion of helium?

He^+ = 1s1 If He^- = 1s2, 2s1
He^+ = 1s1 If He^- = 1s2, 2s1
3 answers · Chemistry · 2 days ago
• ### Which of these two boy names is better?

'Abel' is Biblical from the story of Abel & Cain. 'Jace' is a diminutive for 'Jason; a Classical Greek hero in Homer's Illiad
'Abel' is Biblical from the story of Abel & Cain. 'Jace' is a diminutive for 'Jason; a Classical Greek hero in Homer's Illiad
12 answers · Baby Names · 2 days ago
• ### What do you think of the name Mercedes for a girl?

Sher gave her name to a mator car. 'Heinrich Daimler named his first car after his daughter, Mercedes, and the name stuck .
Sher gave her name to a mator car. 'Heinrich Daimler named his first car after his daughter, Mercedes, and the name stuck .
28 answers · Baby Names · 2 days ago
• ### Thoughts on the name Anaconda?

NO!!! It is a very large snake found in the South American jungle.!!!!
NO!!! It is a very large snake found in the South American jungle.!!!!
9 answers · Baby Names · 2 days ago
• ### Find the area of the triangle:?

Area of Scalene Triangle = 0.5(AB)(AC)Sin11 A = 0.5(68.1)(76.3)Sin11 A = 495.72 units^2
Area of Scalene Triangle = 0.5(AB)(AC)Sin11 A = 0.5(68.1)(76.3)Sin11 A = 495.72 units^2
2 answers · Mathematics · 2 days ago
• ### The area of a triangle is33 square units.If the base is 5 units more than3 times the height,then find the length of the base and the height.?

A = 33 b = 3h + 5 A = 0.5bh Substituting 33 = 0.5(3h + 5)h 66 = 3h^2 + 5h Complete the Square h^2 + 5h/3 = 66/3 = 22 (h + 5/6)^2 - 25/36 = 22 (h + 5/6)^2 = 22 + 25/36 (h + 5/6)^2 = 817/36 h + 5/6 = 28.5832... / 6 h = 33.5832... / 6 h = 5.597... b = 3(5.597... ) + 5 b = 21.79...
A = 33 b = 3h + 5 A = 0.5bh Substituting 33 = 0.5(3h + 5)h 66 = 3h^2 + 5h Complete the Square h^2 + 5h/3 = 66/3 = 22 (h + 5/6)^2 - 25/36 = 22 (h + 5/6)^2 = 22 + 25/36 (h + 5/6)^2 = 817/36 h + 5/6 = 28.5832... / 6 h = 33.5832... / 6 h = 5.597... b = 3(5.597... ) + 5 b = 21.79...
2 answers · Mathematics · 2 days ago
• ### Factorise 3x+6?

3(x + 2)
3(x + 2)
9 answers · Mathematics · 2 days ago
• ### Chemistry Help: When titrating 0.15 M HCl with a calcium hydroxide solution of ...?

Best answer: The Concentration of the acid IS known. It is 0.15M ( 0.15 mol dm^-3) Next write down the Balanced reaction equation Ca(OH)2 + 2HCl = CaCl2 + 2H2O Using the equation moles = [conc] x vol(mL) / 1000 mol(HCl) = 0.15 x 35 / 1000 = 5.25 x 10^-3 (Equivalent to '2' molar ratios) mol(Ca(OH)2) = 5.25 x 10^-3 / 2 = 2.625 x 10^-3... show more
Best answer: The Concentration of the acid IS known. It is 0.15M ( 0.15 mol dm^-3) Next write down the Balanced reaction equation Ca(OH)2 + 2HCl = CaCl2 + 2H2O Using the equation moles = [conc] x vol(mL) / 1000 mol(HCl) = 0.15 x 35 / 1000 = 5.25 x 10^-3 (Equivalent to '2' molar ratios) mol(Ca(OH)2) = 5.25 x 10^-3 / 2 = 2.625 x 10^-3 (equivalent to '1' molar ratio) 2.625 x 10^-3 = [conc] x 25 mL / 1000 Algebraically rearrange conc(Ca(OH)2 = 2.625 x 10^-3 x 1000 / 25 = 0.105 mol dm^-3 = 0.105 M
2 answers · Chemistry · 3 days ago
• ### Prove that the difference between the squares of any two consecutive even numbers is always an odd number multiplied by 4?

Let the numbers be 'n' & 'n+2' Hence their squares n^2 & ( n + 2)^2 Their difference is (n + 2)^2 - n^2 n^2 + 4n + 4 - n^2 => 4n + 4 => 4(n + 1) Since 'n' is even then 'n+1' is odd . and '4' is the multiplying factor.
Let the numbers be 'n' & 'n+2' Hence their squares n^2 & ( n + 2)^2 Their difference is (n + 2)^2 - n^2 n^2 + 4n + 4 - n^2 => 4n + 4 => 4(n + 1) Since 'n' is even then 'n+1' is odd . and '4' is the multiplying factor.
7 answers · Mathematics · 3 days ago
• ### Are elements referred to by their atomic numbers or mass?

YES!!! What you call oxygen -16 as normal oxygen , it is an isotope of oxygen . It just happens to be the most abundant isotope. Similarly C-12, C-13, C-14 Similarly H-1 , H-2, H-3 H-1 (protium) is 'normal' hydrogen H-2 (deuterium) is 'heavy ' hydrogen H-3 (tritium) is 'super heavy' hydrogen and is radio active. ll... show more
YES!!! What you call oxygen -16 as normal oxygen , it is an isotope of oxygen . It just happens to be the most abundant isotope. Similarly C-12, C-13, C-14 Similarly H-1 , H-2, H-3 H-1 (protium) is 'normal' hydrogen H-2 (deuterium) is 'heavy ' hydrogen H-3 (tritium) is 'super heavy' hydrogen and is radio active. ll three are isotopes!!!!
4 answers · Chemistry · 4 days ago