Na2SiO3 (s) + 8HF(aq) → H2SiF6 (aq) +2 NaF(aq) + 3H2O (l) 1.How many moles of HF are needed to react with 87.44 mol of Na2SiO3?

2.How many grams of NaF form when 0.94 mol of HF reacts with excess Na2SiO3?

3.How many liters of Na2SiO3 can react with 54.68 g of HF?

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.

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