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A CaCO3-MgCO3 solid solution contains 3 weight percentage Mg. What is the mole fraction of MgCO3 in the solid?
MnO (catalyst)
2KCIO, --> 2KCI + 30₂
Given the total volume of oxygen gas released is 37cm3 what is the number of moles of gas of oxygen?
What current will deposit 3.25grams of zinc for 2 hours
A.2
B.1
C. 6.022 x 10 raise to power 23
D. 12.044 x 10 raise to power 23
600 mg of gas X occupies 400 cm3 of volume. Calculate the molecular weight in grams.
The lattice energy of MgO is greater than that of MgS because
A. MgO is ionic while MgS is covalent
B. MgO is solid while MgS is gas
C. The charge density of S is greater than that of O
D. The O2- ion is smaller than the S2- ion
Which of the following substances has ions in its bonding model?
A. Copper
B. Carbon dioxide
C. Copper oxide
D. Carbon
Which of the following species is trigonal bi-pyramidal?
A. AlH4-
B. PCl4+
C. PCl5
D. SnH4
K4Fe(CN)63H2O
Diagram above shows the chemical formula of potassium hexacynoferrate (II) trihydrate. What is the relative mass of this compound?
A solution contains 0.71 mol of aluminum chloride in a 910 mL solution. Calculate the molarity of all the ions (Al and Cl) in the solution.
