Lazim D

Numerade Educator

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Educator Statistics

Numerade tutor for 4 years

418 Students Helped

Lazim's Quick Ask Videos

03:17

Chemistry 101

A method of removing CO2 from a spacecraft is to allow the
CO2 to react with sodium hydroxide. (The products of the
reaction are sodium carbonate and water.) What is the pressure of
carbon dioxide gas (in atm) that can be removed per kilogram of
sodium hydroxide at 25°C with a volume of 310 L. ?

01:27

Chemistry 101

Concentrated ammonia solution is 28.0% m in NH3 and has a density of 0.899 g/mL (at 25°C). What volume of this reagent should you dilute to 1.000 L to make a solution that is 45 mM in NH3?

01:19

Chemistry 101

A chemist determined by measurements that
0.075
moles of beryllium participated in a chemical reaction.
Calculate the mass of beryllium that participated in the chemical
reaction.
Be sure your answer has the correct number of significant
digits.

01:33

Chemistry 101

Calculate the concentration of CO2 in water at 25°C when the pressure of CO2 over the solution is 4.9 atm. At 25°C, the Henry's law constant for CO2 in water is 3.1 × 10^−2 mol/L · atm.

02:27

Chemistry 101

Suppose you heat a metal object with a mass of 30.9 g to 96.3 °C and transfer it to a calorimeter containing 100.0 g of water at 18.7 °C. The water and metal reach a final temperature of 24.5 °C.
What is the specific heat of the metal in J/g-°C?

01:47

Chemistry 101

An expandable balloon on the ground contains 1400L of He at 0.950 atm pressure and a temperature of 18°C. At an altitude of 44 km, the temperature is 2°C and the pressure is 4.0 torr. What is the volume of the balloon up there? (Do not use 44 km in your calculation)

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