For the reaction 2HNO3 + Mg(OH)2 -> Mg(NO3) 2 + 2H20, how many grams of magnesium nitrate are produced from 2 grams of nitric acid, HNO3 ?

Answer 1

Where to start:

1. Identify your given: 2 g HNO₃
2. What you're looking for: ? g Mg(NO₃)₂
3. Pathway: grams HNO₃ → moles HNO₃ → moles g Mg(NO₃)₂ → grams Mg(NO₃)₂

use molar mass to convert from grams to moles: molar mass/ 1 mole

use the coefficients from the equation to convert from moles HNO₃ to moles Mg(NO₃)₂

when converting, set the unit you are trying to cancel out opposite to one another

2 g HNO₃ × (1 mol HNO₃ / 63.01 g HNO₃) × (1 mol Mg(NO₃)₂ / 2 mol HNO₃) × (148.3 g Mg(NO₃)₂ / 1 mol Mg(NO₃)₂) = 2.35 g Mg(NO₃)₂

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