<div><img src="http://thimg.todayhumor.co.kr/upfile/201405/1401166416q5LXnZql.jpg" alt="CHEM.JPG" style="font-size:9pt;line-height:1.5;" /></div> <div><br /></div> <div> <div style="line-height:21.600000381469727px;">이문제 화요일날 풀어봣는데, 그날못풀고 다른공부할거때매 못햇다가 지금하고있는데요</div> <div style="line-height:21.600000381469727px;">제가 풀어본건데, 맞앗는지 틀렷는지좀 봐주세요</div> <div style="line-height:21.600000381469727px;"><br /></div> <div style="line-height:21.600000381469727px;">4mM = 4 * 10^-3 M (concentration)</div> <div style="line-height:21.600000381469727px;">Molar mass of <span style="font-size:9pt;line-height:1.5;">Na2CO3 - 1.5H2O2 = 156.96</span></div> <div style="line-height:21.600000381469727px;"><br /></div> <div style="line-height:21.600000381469727px;">concentration = moles / Volume</div> <div style="line-height:21.600000381469727px;">moles = c*V</div> <div style="line-height:21.600000381469727px;"><span style="white-space:pre;"> </span> = 0.0002</div> <div style="line-height:21.600000381469727px;"><br /></div> <div style="line-height:21.600000381469727px;">n = mass / Molar mass</div> <div style="line-height:21.600000381469727px;">mass = nM</div> <div style="line-height:21.600000381469727px;"><span style="white-space:pre;"> </span> = 0.0002 * 156.96</div> <div style="line-height:21.600000381469727px;"><span style="white-space:pre;"> </span> = 0.031392 g</div> <div style="line-height:21.600000381469727px;"><span style="white-space:pre;"> </span> = 31.392 mg (mg = 1g * 10^-3)</div> <div style="line-height:21.600000381469727px;"><br /></div> <div style="line-height:21.600000381469727px;"><br /></div> <div style="line-height:21.600000381469727px;">꼭 답 부탁드립니다</div></div>
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