Inorganic Chemistry Answers

What volumes of 0.50 M HNO2 and 0.50 M NaNO2 must be mixed to prepare 1.00 L of a solution buffered at pH = 3.62?

why shadow is not a matter?

which of the following elements of matter would best convey that there is life on earth
a)oxygen b) hydrogen c) carbon d) iron.

1,Suppose you are asked to prepare 3.00g of Baso4, an insoluble salt, bu reacting Ba(No3)2 with Na2SO4
a)Write a balanced chemical equation for the reaction
b)Calculate the mass of solid Ba(NO3)2 required
c)Calculate the mass of solid NaSO4 required.
2 Calculate the percentage yield if you performed the experiment described in question 1 and obtained 2.50g BaSO4.

My result
a)BaSO4 + 2NaNO3
b) molar mass 261.37 (I'm not sure what divide)
c)molar mass 142.04 (i'm not sure what divide)

2) I know its actual yield/theoretical yield x 100% ( again I'm not sure what numbers are plug in)

Thanks

what is diads tetrad in solids states

What are the steps to make 3 kg of saline solution with concentration 0,5%

Write the mass action law for the following reactions
In which cases the expression can be simplified by constant concentrations into account?
a.Ni(CO)4 ------> Ni+4CO
b. HF --------> H+ + F-
c.2Ag+Zn2+ ---------> 2Ag+ +Zn

If 9.65 moles of an ideal gas has a pressure of 4.77 atm, and a volume of 43.85 L, what is the temperature of the sample?

What volume of H2(g) is produced when 8.80 g of Al(s) reacts at STP?

calculate the volume in liters occupied by 7.40 g of NH3 at STP