# Hydrofluoric acid, HF(aq), cannot be stored in glass bottles because compounds called silicates in the glass are attacked by the HF(aq). Sodium silicate (Na2SiO3), for example, reacts as follows: Na2SiO3(s)+8HF(aq)→H2SiF6(aq)+2NaF(aq)+3H2O(l)?

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A)How many moles of HF are needed to react with 0.260 mol of Na2SiO3?

B) How many grams of NaF form when 0.600 mol of HF reacts with excess Na2SiO3?

C)How many grams of Na2SiO3 can react with 0.900 g of HF?

A)How many moles of HF are needed to react with 0.260 mol of Na2SiO3?

B) How many grams of NaF form when 0.600 mol of HF reacts with excess Na2SiO3?

C)How many grams of Na2SiO3 can react with 0.900 g of HF?

##### 1 Answer

A) 2.08 moles of HF

B) 6.2982255 grams

C)0.6871978 grams

#### Explanation:

For all our questions we need to find the mole ratio formula for this reaction that is

Our question is

So solve for ratio

Thus 0.15 moles of NaF are formed.

Mass of 0.15 moles of NaF =

First we need to find number of moles in 0.900g of HF by using the formula =

Molar mass of HF = 20.01 g per mol

number of moles in 0.900g of HF =

the ratio for Na2O3Si to HF = 1 : 8

so we need to use unitary method again

0.00563mol Na2O3Si : 0.045molHF