General Chemistry Answers

How to arrange the following elements in order of increasing in electronegativity

(Beryllium, Nitrogen and Magnesium)

A sample of nitrogen gas, N2, is collected in a 100 mL container at a pressure of 688 mm Hg and a temperature of 565 °C. How many grams of nitrogen gas are present in this sample? Round-off your answer up to 3 significant figures

4. A 3.50 g of solid CO2 isplaced in a 4.00 L container at a temperature of 300 K. When all

the solid CO2 becomes gas, what will be the pressure in the container?

1. You are task to collect gases such as N2, O2, CO2, and Ar gas. The partial pressures of N2,

O2, and CO2 are 515 torr, 215 torr, and 98 torr respectively. What is the partial pressure of

Ar, if the total pressure is 715 torr?

2. The partial pressure of N2 in a mixture of gases where the total pressure is 1.00 atm

is 400 torr. What is the mole fraction of N2?

3. A mixture of air which consists of 26% oxygen, 68% nitrogen, and 6 % traces gases

at a 1 atmospheric pressure. Use those percentages to compute for the individual

pressure of each gas at STP applying Dalton`s law of partial pressures.

4. A mixture of 25.0 g oxygen and 65.0 g of helium used by deep-sea diver has a total

pressure of 5 atm. What will be the partial pressure of each gas?

13.2g of gas has volume 0.918dm³ at 25^OC and 8atm pressure. Find molecular mass of the gas.

1. How many moles of ethane is required to produce 44 g of CO2 (g) after combustion.

2. Calculate the number of molecules of oxygen gas that occupies a volume of 224 ml at 273 K and 3 atm pressure.

3. How much volume of chlorine is required to form 11.2 L of HCl at 273 K and 1 atm pressure?

4. Calculate the percentage composition of the elements present in magnesium carbonate. How many kilograms of CO2 can be obtained by heating 1 kg of 90 % pure magnesium carbonate?

5. What is the mass of the precipitate formed when the preparation of alkyl halides 50 ml of 16.9 % solution of AgNO3 is mixed with 50 ml of 5.8 % NaCl solution?

6. Urea is prepared by the reaction between ammonia and carbon dioxide. 2 NH3(g) + CO2(g) (NH4)2CO(aq) + H2O(l) In one process, 637.2 g of NH3 are allowed to react with 1142 g of CO2.

(a) Which of the reactants is the limiting reagent?

(b) Calculate the mass of (NH4)2CO formed.

(c) How much of the excess reagent in grams is left at the end of the reaction?

Difference between the behavior of NaOH and CH3OH in aqueous solution?

Determine the number of atoms present in 4.0g of sodium hydroxide [ Na=23, C=12, O=16, H=1 , 1

mole of a substance contains 6.022 ×1023 atoms ]

Show the formation of ions in the following ionic compounds.

MgCl2

KI

CaF2

Predict the formula of the ionic compounds formed by the following elements.

Li and K

Be and Cl

Li and Se

Mg and F

Na and N

Write the formula of the molecular compounds formed by the following nonmetallic elements.

As and Cl

N and O

Se and Cl

C and Br

P and O