Chemistry Quiz 7
How many moles are present in a sample of HCl with a mass of 3.65 g?
0.100 moles
How many moles are present in 6.02 x 10^24 molecules of I2?
10.0 mol
What is the mass of 4.36 x 10^23 molecules of CCl4?
111 g
What is the molar mass of KClO3?
122.55 g
What is the mass of 0.360 moles of HCl?
13.1 g
What is the molar mass of CaSO4?
136.14 g ??
How many moles of silver ions are present in 32.46 g of AgNO3?
0.191 moles
What is the mass of 3.06 x 10^22 molecules of CO2?
2.24 g
How many O atoms are present in 1.04 moles of MgSO4?
2.51 x 10^24 atoms
How many molecules are present in 4.21 moles of HBr?
2.53 x 10^24
What is the molar mass of Mg(ClO4)2?
223.21 g/mol
How many grams of carbon are present in 45.0 g of CCl4?
3.51 g
What is the percent by mass of chlorine in Ca(ClO3)2?
34.3%
What is the mass of one mole of HCl?
36.46 g
How many molecules are present in 0.340 g of HCl?
5.61 x 10^21
A 5.00 g sample of potassium chloride is found to contain 2.62 g of potassium. What is the percent by mass of potassium in the compound?
52.4%
What is the molar mass of sodium chloride?
58.44 g/mol
How many units of MgSO4 are present in 18.0 g of this compound?
9.00 x 10^22 ??
What is the molecular formula of a compound with the empirical formula CH and molar mass of 26.04 g?
C2H2
What is the molecular formula of a compound with the empirical formula CH2O and molar mass of 180.18g?
C6H12O6
What is the empirical formula of a substance that consists of 85.60% carbon and 14.40% hydrogen?
CH2
What is the empirical formula of a compound that consists of 2.424 g magnesium, 3.197 g sulfur, and 6.380 g oxygen?
MgSO4
A compound consists of 4.50 g of nitrogen for every 7.71 g of oxygen and has the same empirical and molecular formula. Identify the compound.
N2O3
In which pair would both compounds have the same empirical formula? a. C2H4 and C3H6 b. K2CrO4 and K2Cr2O7 c. NaHCO3 and Na2CO3 d. FeCl3 and FeCl2
a
Which of the following contains the largest number of moles? Group of answer choices 1.0 g of sodium 1.0 g of silver 1.0 g of aluminum 1.0 g of lithium
a. 0.0434976 b. 0.00927 c. 0.03706 d. 0.14407 this one??
