Question

Write a balanced equation:

// CaCO3 (s) + 2HCl(aq) ---> CO2(s) + CaCl2(aq) + H2O(l) // okay with this

A. A flask holds a total of 402.5 g of water at 20.40C. What is the volume of the flask? (density is .9982 g/ml)

///Got .4032 L(is this correct?)///

B. Assuming that the pressure is 758.4 torr and the temperature is 24.60C, calculate the mass of dry air in the flask. (density is 1.185 g)

///Got .4778g - Is this Correct? ///

C. Assuming the mass of the flask filled with dry air is 125.383 g, calculate the mass of the empty flask.

/// 124.905 g? ///

D. Assuming the mass of the flask filled with CO2 is 125.557g , the temperature is 23.20 C, and the pressure is 758.4 torr, calculate the molecular weight of CO2.

/// 39.4 CO2? //

E. Calculate the actual molecular weight of CO2 and determine the percent error.

//90%// Annoying me that it's not cloase to 98-100%...am i doing something wrong?

Answer 1

No all the calcualation you have did is right there must be some mistake in the mass given

all other calculation i have done and getting the same values as you did

except

percent error = (44 g/mol - 39.4 g/mol / 44 g/mol) * 100 % = 10.45 %