Chm 1030
Avogadro's number is the number of ________.
particles in 1 mole of a substance
A chemical equation is balanced when ________.
the number of atoms of each element is the same in reactants and products
In any balanced chemical equation, the number of each type of atom on both sides of the equation is ________.
the same
3.00 moles of NO2 have a mass of ________.
138 g
What is the molar mass of copper(II) sulfate?
159.6 g/mole
What is the molar mass of sodium phosphate?
163.9 g/mole
In the following reaction, what is the correct coefficient for aluminum chloride? Al+Cl→AlCl3
2
In this reaction, what is the correct coefficient for sodium chloride? Pb(NO3)2+?NaCl → PbCl2 + ?NaNo3
2
One mole of copper(II) sulfate, contains ________ O atoms.
2.41 × 10^24
0.400 mole of sucrose, C12H22O11, contains ________ C atoms.
2.89 × 10^24
One mole of neon atoms has a mass of
20.18 g
What is the molar mass of a substance formerly used in medicine as an antacid?
262.9 g/mole
Which of the following gives the balanced equation for this reaction?
2K3PO4+ 3Ca(NO3)2→ Ca3(PO4)2 + 6 KNO3
For the following reaction, what is the correct coefficient for the H2? Fe+HCl→FeCl3 +H2
3
What is the coefficient of hydrogen, H2 , when the following equation is balanced? Al + H2SO4 →AL2(SO4)3 + ?H2
3
What is the molar mass of sucrose (C12H22O11)?
342.3 g/mole
The molar mass of potassium is ________.
39.10 g/mole
One mole of copper(II) sulfate, contains ________ moles of O.
4
One mole of helium gas weighs ________.
4.003 g
How many moles of water, O, are present in 75.0 g H2O?
4.16 moles
0.400 mole of sucrose, C12H22O11 , contains ________ moles of C.
4.80
What is the coefficient for carbon dioxide in the balanced equation? C5H12+? O2→ ?CO2 +?H2O
5
What is the coefficient for water in the balanced equation?C5H12+? O2→ ?CO2 +?H2O
6
One mole of particles of any substance contains how many particles?
6.02 ×10^23 particles
How many grams of glucose (C6H12O6) are in 3.55 moles of glucose?
640 g
What coefficient is placed in front of to complete the balancing of the following equation? C5H8 + ? O2 → 5 CO2 + 4H2O
7
The molar mass of calcium hydroxide is ________.
74.10 g/mole
Calculate the molar mass of potassium chloride?
74.55 g/mole
The molar mass of C3H8O2 is
76.09 g/mole
How many grams of Fe2O3 are there in 0.500 mole of Fe2o3?
79.9 g
What is the coefficient for oxygen in the balanced equation? C5H12+? O2→ ?CO2 +?H2O
8
4.00 moles of sodium have a mass of
92.0 g
Calculate the molar mass of magnesium chloride.
95.21 g/mole
How many moles of K2SO4 are in 15.0 g of K2SO4?
0.0861 moles
0.100 mole of lithium has a mass of ________.
0.694 g
In this reaction, what is the coefficient for calcium oxide?CaO+CO2→CaCO3
1
Which of the following correctly gives the correct coefficients for the reaction below? N2H4 + H2O2 → N2 + H2O
1, 2, 1, 4
How many moles of carbon atoms are there in 0.500 mole of C2H6?
1.00 mole
The following reaction is an example of a ________ reaction.
C5H8 + 7O2→ 5CO2+4 H20
In a ________ reaction, two or more elements or compounds form one product.
Combination
The reaction of carbon with oxygen to produce carbon monoxide is an example of which class of reaction? 2C+O2→2CO
Combination
What is the classification for this reaction? SO3+H2O→ H2SO4
Combination
The following reaction takes place when an electric current is passed through water. It is an example of a ________ reaction. 2H20 → (electricity) 2 H2+ O2
Decomposition
What is the classification for this unbalanced reaction? Fe+HCl→FeCl3 +H2
Decomposition