Blog

Using the following diagram:   If CO2 is at a pressure of 150 kPa and 100 Kelvin, and the temperature is increased to 300 K, what phase change has occurred?

Given the reaction: 4 NH3  +  5 O2  –>  4 NO  +  6 H2O If 8.0 moles of NH3 reacts with 8.0 moles of O2, what is the limiting reactant?

Lithium has two stable isotopes.  An average sample of lithium would contain the following:   4.85% of lithium-6 and 95.15% of lithium-7.  Which mathematical set-up would determine the atomic mass of naturally occurring lithium?

Please indicate whether the following are empirical and molecular formulas.   Please indicate empirical or molecular, you do not write the word “formula”. MgCl2 [1] N2O4 [2] Al2O3 [6]

Given the reaction: 2 Na  +  2 H2O  –>  2 NaOH  +  H2 What is the total number of moles of hydrogen gas produced when 4.0 moles of sodium reacts completely?

If the temperature of 96.5g of water increases from 25.2 ° C to 37.6 ° C, how much heat did the water absorbed? Hint: Specific heat of water is 4.184J/g ° C Answer:[BLANK-1] kJ (Provide your answer with correct sig. figs. and DO NOT include units in your answer, as it has been provided)

An experiment yielded 80 grams of NaCl while the theoretical yield of NaCl was 90 grams.  What is the percent yield?

6 CO2  +  6 H2O  –>  C6H12O6  +  6 O2 The average human requires 115 grams of glucose (C6H12O6) per day.  How many grams of carbon dioxide are required for this amount of glucose? The answer will be in grams; however, do not type in units into the answer box, only numbers.

5.0 moles of NaOH is dissolved in a 500 mL solution.  What is the molarity? Please type in your calculations.

What does the specific heat capacity of a substance or material represent?