ucation.com/hm.tpx General Chemistry I(CHEM 1123 Se 30755 MWF 9:00-95 CHEMISTRY

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ucation.com/hm.tpx General Chemistry I(CHEM 1123 Se 30755 MWF 9:00-95 CHEMISTRY Question 18 (of 20 3 attempts aet Check my wortk 3 attempts iet Enter your answer in the provided box. A piece of sodium metal reacts completely with water as f 2Na(s) + 21120() 2NaOH(aq) + 112(g) 23.0°C. The volume of the gas is 457 ml The hydrogen gas generated is cellected over water at measured at 1.001 atm. Cakulate the number of grams of sodium used i he reaction. ( pressure of water at 23.C-0.0277 atm.) he vapor Type here to search /u 2 4 W E R TY

Explanation / Answer

Lets find the number of mol of H2 generated

Given:
P = 1.001 atm - 0.0277 atm = 0.9733 atm
V = 457.0 mL
= (457.0/1000) L
= 0.457 L
T = 23.0 oC
= (23.0+273) K
= 296 K

find number of moles using:
P * V = n*R*T
0.9733 atm * 0.457 L = n * 0.08206 atm.L/mol.K * 296 K
n = 1.831*10^-2 mol

from reaction,
mol of Na reacted = 2*mol of H2 produced
= 2*1.831*10^-2 mol
=3.662*10^-2 mol

Molar mass of Na = 22.99 g/mol

use:
mass of Na,
m = number of mol * molar mass
= 3.662*10^-2 mol * 22.99 g/mol
= 0.8419 g
Answer: 0.842 g

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