General Chemistry Answers

What is the name of Al₂S₃?

C3H8 + O2                       CO2 + H2O

If you start with 14.8g of C3H8 and 3.44g of O2, how many grams of H2O are produced?

Which is the limiting reagent (which reactant created less H2O? _______

How many grams of the non-limiting reagent are actually used?

How many grams of the non-limiting reagent are in excess?

Note : Balance first the equation

It becomes    C3H8 +5O2              3 CO2 + 4H2O

For the following endothermic reaction at equilibrium

A_(s) + B_(aq) ⇌ C_(aq)

Which of the following conditions will cause the reaction to produce more products?

Select as many answers as are appropriate however marks will be deducted for incorrect guesses.

Select one or more:

Lowering the temperature

Adding more "B"

Adding more "A"

Adding a catalyst

Adding more "C"

Raising the temperature

Steam reacts reversibly with iron at red-heat in the following way.

3Fe(s)+4H 2 O(g) rightleftharpoons Fe 3 O 4 (s)+4H 2 (g)

Describe and explain what happens when the conditions of the reaction are varied as follows:

(a) Increasing the partial pressure of the steam.

(b) Adding more of the iron (I] ) diiron * (IV) oxide, F*e_{3} * O_{4}

(c) Removing the hydrogen gas formed.

If the pressure on 200cm3 of a sample of air is doubled at constant temperature. What will be it's new volume.

Naturally occurring lithium has 7.45% 6Li and 92.6% 7Li.what is the RAM of the lithium?

110 g of manganese was extracted from 174 g of manganese oxide. (Ar: Mn=55, O=16)

a) What mass of oxygen atoms is this?

110 g of manganese was extracted from 174 g of manganese oxide. (Ar: Mn=55, O=16)

a) What mass of oxygen atoms is this?

1.     How many grams of BaCl₂ should be added to 300 g H₂O so that the freezing point of the solution is lowered – 8.3 ⁰C ? Assume that the BaCl₂  completely dissociates in the solution.

The equilibrium constant, K_c, for the following reaction is 7.00×10^-5 at 673 K.

NH₄I(s) NH₃(g) + HI(g)

Calculate the equilibrium concentration of HI when 0.210 moles of NH₄I(s) are introduced into a 1.00 L vessel at 673 K.

[HI] =   M