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What is the empirical formula for a compound composed of 0.1417 mol of carbon (C), 0.0708 mol of hydrogen (H), and 0.0354 mol of nitrogen (N)?
A sample of aluminum foil contains 7.80×1023 atoms. What is the mass of the foil?
How many total atoms are in 0.510 g of P2O5?
The source of bitterness in dark chocolate is the compound theobromine, an alkaloid present in cocoa beans. In a sample of dark chocolate there are 6.42×10^20 molecules of theobromine present.
How many milligrams of theobromine are present in the sample? The molecular formula for theobromine is C7H8N4O2
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A beaker contains 45.5 mL of carbon tetrachloride (CCl4, density is 1.59 g/mL).
Determine how many molecules of carbon tetrachloride are in the beaker.
A solution is made of
- 1 mmol of non-volatile solute A
- 2 mmol of non-volatile solute B
- 3 mmol of non-volatile solute C
- 4 mmol of non-volatile solute D
- 0.990 mol of solvent.
Assume that the solvent is water, what is the vapor pressure of this solution at the normal boiling point of water?
A solution is made of
- 1 mmol of non-volatile solute A
- 2 mmol of non-volatile solute B
- 3 mmol of non-volatile solute C
- 4 mmol of non-volatile solute D
- 0.990 mol of solvent.
Assume that the solvent is water, what is the vapor pressure of this solution at the normal boiling point of water?
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Answer the following question and identify the property of water that explains why:
1. There is a large drop in temperature during evaporation.
chloroform (CHCl3) is a known aesthetic. it is also used to produce the refrigerant carbon tetrachloride (CCl4) according to the reaction: CHCl3 (g) + Cl2 (g) CCl4 (g) + HCl (g)
write the law expression for the reaction. calculate the rate constant
The standard enthalpy changes for the formation of aluminium oxide and iron (III) oxide are:
2 Al(s) + 3/2 O2 (g) Al203(s) ∆H= -1676 kJ/mol
2 Fe (s) + 3/2 O2 (g) Fe2O3 (s) ∆H= -824 kJ/mol
