RRB Technician Grade 3 practice question
An element 'Cu' has two isotopes Cu-63 and Cu-65 with natural abundance 70% and 30% respectively. What is the average atomic mass of Cu?
From a RRB Technician Grade 3 Science practice set · Science
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Correct answer: (C) 63.6 u
Average atomic mass = (mass1×%abundance1 + mass2×%abundance2)/100 = (63×70 + 65×30)/100 = 63.6 u.
हिंदी में प्रश्न
किसी तत्व 'Cu' के दो समस्थानिक Cu-63 और Cu-65 हैं जिनकी प्राकृतिक बहुलता क्रमशः 70% और 30% है। Cu का औसत परमाणु द्रव्यमान क्या है?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (C) 63.6 u
औसत परमाणु द्रव्यमान = (द्रव्यमान1×%बहुलता1 + द्रव्यमान2×%बहुलता2)/100 = (63×70 + 65×30)/100 = 63.6 u।
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