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An oxygen sample of 1.62 L is at 0.911 atm and 30.0°C.How many moles of oxygen are in the sample?

If 12.6 g of CuSO4 (molar mass 159.61 g/mol) is dissolved in water to make a 0.350 M solution of CuSO4, what is the volume of the solution in milliliters? Show all your work for full credit. Use the correct number of significant figures.

Perform the following conversions between energy units. a) 721 kJ  =  [i_1] ×10[i_2] J b) 3255 kcal  =  [ii_1] × 10[ii_2] kJ c) 5.50 ×106 J  =  [iii_1] × 10[iii_2] kcal

How many double bonds are present in the Lewis structure of NO2- in which the formal charge of N is zero?

Calculate the enthalpy change for the following reaction: 2CO(g) + 4H2O(l) → 2CH4(g) + 3O2(g) ∆H = ? Given the following reactions and their ∆H values: CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ∆H = -890.0 kJ 2CO(g) + O2(g) → 2CO2(g) ∆H = -566.0 kJ

Calculate the pressure of 2520 moles of hydrogen gas stored at 27.0oC in the 180. L storage tank of modern hydrogen-powered car.

What are the bond angles around a central atom with sp hybridized orbitals?

Calculate the molar mass of a gas if 0.728 g of this gas occupies 0.250 L at 0.955 atm and 297 K. Show all your work for full credit. Use the correct number of significant figures.

Determine whether the following reaction is a redox reaction. If it is, identify the element that is oxidized, the element that is reduced, the oxidizing agent, and the reducing agent. Mg(s) + 2HCl(aq) → MgCl2 (aq) + H2(g)

Determine whether the following reaction is a redox reaction. If it is, identify the element that is oxidized, the element that is reduced, the oxidizing agent, and the reducing agent. C8H18(g) + 25O2(g) → 16CO2(g) + 18H2O(l)