Calculate P, V, n, or T using the ideal-gas equation?

A leaky balloon loses gas until it drops from a volume of 9.8 L to 1.5 L. If it started with 0.402 mol of helium gas, how many moles of helium gas remain in the balloon after it has finished leaking? Assume temperature and pressure stay constant. Answer with three sig figs and show all work.

Question 11.Consider the following balanced equation:Show all work in order and us sigfig in final answer 2H2O --> 2H2 + O2 15.7g of H2O decomposes. What volume of Hydrogen gas would be formed if it were collected at 789 mmHg and 30.0 degrees C? Numerical Answer:    Unit:   Label:     Blank 1:  Blank 2:  Blank 3:

One mole of CO2 gas is heated and its temperature increases by 10 K. If the same heat is given to 2 moles of H2S gas, how much does its temperature change? (Assume that the molecular vibrations don't change the heat absorption).

The pressure of a gas is measured as 60. torr. Represent this pressure in atmospheres. (1 atm = 760 torr) Show work.

A weather balloon contains 143 liters of helium gas at a pressure of 700 torr. If the temperature at ground level is 16 °C, how many moles of helium gas does the balloon contain? Answer with three sig figs and show all work.

7,845 cal is equal to how many Joules

In lesson 6, the first synthesis reaction used solid zinc and solid iodine to yield solid zinc iodide as shown in the chemical equation below. The chemical reaction was carried out four additional times as shown by the data table below. Predict both the final temperature and the temperature change of the surroundings for trial 3. Explain your reasoning for your prediction by defining the relationship between the masses of the reactants (solid zinc and solid iodine) and the temperature change of the surroundings as either direct, inverse, or having no relationship.

When 56.8 of lead reacts with 3.50 L of oxygen gas, measured at 1.00 atm and 25.0 degrees Celsius, 60.1 kj of heat is released at constant pressure. What is the change in enthalpy at standard condition for the reaction (Please type answer no write by hend)