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A)How many H atoms are present in a 4.25 ng sample of urea,CO(NH2)2? give answer accurate to three signifiacnt figures
B)If 10.24 g of a pure element contains 6.761 x 10 22 atoms, whatis the element?
C)What mass of O is found in 58.7 g K2Cr2O7?give answer accurate to3 significant figures
D)Complete combustion of 1.744 g of a particular hydrocarbonyielded 5.105 g CO 2 and 3.135 g of H 2 O. What is the empiricalformula of this hydrocarbon?
E)A 4.2039-g sample of a hydrate of Cu(NO3)2 was heated to driveoff all of the water of hydration. The remaining solid weighed3.2635 g. If Cu(NO3)2.x H2O represents the formula of the hydrate,then what is the value of x?
F)How many grams of H3PO4 are produced if the following reactionyielded 24.1 g HCl? (Enter your answer in grams accurate to 3significant figures
G)What is the minimum mass of oxygen, in grams, needed to burn 39.7g C6H6O? Give your answer to three significant figures
H)What is the maximum mass of I2 that can be obtained from 38.2 gKMnO4, 114 g KI and excess H2SO4? Give your answer in grams tothree significant figures
A)How many H atoms are present in a 4.25 ng sample of urea,CO(NH2)2? give answer accurate to three signifiacnt figures
B)If 10.24 g of a pure element contains 6.761 x 10 22 atoms, whatis the element?
C)What mass of O is found in 58.7 g K2Cr2O7?give answer accurate to3 significant figures
D)Complete combustion of 1.744 g of a particular hydrocarbonyielded 5.105 g CO 2 and 3.135 g of H 2 O. What is the empiricalformula of this hydrocarbon?
E)A 4.2039-g sample of a hydrate of Cu(NO3)2 was heated to driveoff all of the water of hydration. The remaining solid weighed3.2635 g. If Cu(NO3)2.x H2O represents the formula of the hydrate,then what is the value of x?
F)How many grams of H3PO4 are produced if the following reactionyielded 24.1 g HCl? (Enter your answer in grams accurate to 3significant figures
G)What is the minimum mass of oxygen, in grams, needed to burn 39.7g C6H6O? Give your answer to three significant figures
H)What is the maximum mass of I2 that can be obtained from 38.2 gKMnO4, 114 g KI and excess H2SO4? Give your answer in grams tothree significant figures
B)If 10.24 g of a pure element contains 6.761 x 10 22 atoms, whatis the element?
C)What mass of O is found in 58.7 g K2Cr2O7?give answer accurate to3 significant figures
D)Complete combustion of 1.744 g of a particular hydrocarbonyielded 5.105 g CO 2 and 3.135 g of H 2 O. What is the empiricalformula of this hydrocarbon?
E)A 4.2039-g sample of a hydrate of Cu(NO3)2 was heated to driveoff all of the water of hydration. The remaining solid weighed3.2635 g. If Cu(NO3)2.x H2O represents the formula of the hydrate,then what is the value of x?
F)How many grams of H3PO4 are produced if the following reactionyielded 24.1 g HCl? (Enter your answer in grams accurate to 3significant figures
G)What is the minimum mass of oxygen, in grams, needed to burn 39.7g C6H6O? Give your answer to three significant figures
H)What is the maximum mass of I2 that can be obtained from 38.2 gKMnO4, 114 g KI and excess H2SO4? Give your answer in grams tothree significant figures
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Reid WolffLv2
3 May 2019
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