Sadie M. answered 02/14/23
Tutor
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Chemistry Teaching Expert! 8+ Years Experience- General & Organic Chem
Where to start:
- Identify your given: 2 g HNO3
- What you're looking for: ? g Mg(NO3)2
- 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
Any other questions, feel free to message me :)