객관식
Consider the reaction: 2Al(OH)3 + 3H2SO4 \(\rightarrow\) x + 6y. What are the correct formulas for x and y?
128
views
3. Chemical Reactions
Balancing Chemical Equations
객관식
Which of the following is the correctly balanced chemical equation for the reaction between NaBr and H3PO4 to form Na3PO4 and HBr?
A
NaBr + 3 H3PO4 → Na3PO4 + HBr
B
NaBr + H3PO4 → NaPO4 + HBr
C
2 NaBr + H3PO4 → Na2PO4 + 2 HBr
D
3 NaBr + H3PO4 → Na3PO4 + 3 HBr
검증된 단계별 안내1
Identify the reactants and products in the chemical reaction: sodium bromide (NaBr) reacts with phosphoric acid (H3PO4) to form sodium phosphate (Na3PO4) and hydrobromic acid (HBr).
Write the unbalanced chemical equation: \(\text{NaBr} + \text{H}_3\text{PO}_4 \rightarrow \text{Na}_3\text{PO}_4 + \text{HBr}\).
Balance the sodium (Na) atoms first. Since there are 3 sodium atoms in \(\text{Na}_3\text{PO}_4\), place a coefficient of 3 before NaBr: \(3 \text{NaBr} + \text{H}_3\text{PO}_4 \rightarrow \text{Na}_3\text{PO}_4 + \text{HBr}\).
Balance the bromine (Br) atoms next. There are 3 bromine atoms on the left (from 3 NaBr), so place a coefficient of 3 before HBr on the right: \(3 \text{NaBr} + \text{H}_3\text{PO}_4 \rightarrow \text{Na}_3\text{PO}_4 + 3 \text{HBr}\).
Check that hydrogen (H) and phosphorus (P) atoms are balanced. Phosphorus is balanced with 1 atom on each side, and hydrogen atoms are balanced because 3 H in \(\text{H}_3\text{PO}_4\) correspond to 3 H in 3 HBr.
관련 영상
관련 실천
