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일반화학/[01장] 서론: 물질과 측정315

질량 환산. 242 lb를 mg으로 질량 환산. 242 lb를 mg으로 [참고] 질량 환산 [ https://ywpop.tistory.com/22440 ] ---> 1 lb = 453.59237 g > 242의 유효숫자 = 3개 ( 참고 https://ywpop.tistory.com/3212 ) (242 lb) (453.59237 g / 1 lb) (1000 mg / 1 g) = (242) (453.59237) (1000) = 109769353.54 mg ---> 유효숫자 3개에 맞추면, = 1.10×10^8 mg 답: 1.10×10^8 mg [키워드] 242 lb to mg 기준 2024. 3. 18.
속력 환산. 65 mi/h to km/h 속력 환산. 65 mi/h to km/h Convert 65 miles per hour (mi/h) to units of kilometers per hour (km/h). The conversion 1 mile = 1.609 km may be used. (65 mi/h) (1.609 km / 1 mi) = 104.585 ---> 유효숫자 2개에 맞추면, = 1.0×10^2 km/h 답: 1.0×10^2 km/h [참고] 속력 환산. 65 mi/h to km/s Convert 65 miles per hour (mi/h) to units of kilometers per second (km/s). The conversion 1 mile = 1.609 km may be used. (65 mi/h) (1.609 .. 2024. 3. 18.
1989 Exxon Valdez Alaska 240,000 barrels 42 gal 1989 Exxon Valdez Alaska 240,000 barrels 42 gal In March 1989 the Exxon Valdez ran aground and spilled 240,000 barrels of crude petroleum off the coast of Alaska. One barrel of petroleum is equal to 42 gal. How many liters of petroleum were spilled? [참고] 부피 환산 [ https://ywpop.tistory.com/17461 ] > 1 gal = 3.785411784 L (240000 barrels) (42 gal / 1 barrel) (3.785411784 L / 1 gal) = (240000) (42) .. 2024. 3. 17.
온도환산. 7×10^7 ℉를 ℃로 환산 온도환산. 7×10^7 ℉를 ℃로 환산 [참고] 온도 환산 [ https://ywpop.tistory.com/6662 ] 숫자 7×10^7 의 유효숫자는 1개. ℃ = (℉ – 32) / 1.8 = ((7×10^7) – 32) / 1.8 = 38888871.1111 ---> 유효숫자 1개에 맞추면, = 4×10^7 답: 4×10^7 ℃ [키워드] 화씨를 섭씨로 기준 2024. 3. 17.
1,566,311의 과학적 표기법. 3개의 유효숫자로 1,566,311의 과학적 표기법. 3개의 유효숫자로 Round off each of the following numbers to three significant digits, and express the result in standard scientific notation. a. 1,566,311 b. 2.7651×10^(-3) c. 0.07759 d. 0.0011672 [참고] 과학적 표기법 [ https://ywpop.tistory.com/6868 ] 답: a. 1.57×10^6 b. 2.7651×10^(-3) ---> 2.77×10^(-3) c. 0.07759 ---> 7.76×10^(-2) d. 0.0011672 ---> 1.17×10^(-3) [키워드] 교재 오타 기준, 교재 오류 기준, 15.. 2024. 3. 16.
standard Olympic-size swimming pool contains 2.5 ML water standard Olympic-size swimming pool contains 2.5 ML water A standard Olympic-size swimming pool contains 2.5 ML of water. What volume is this in m3? 2.5 ML = 2.5 million liters = 2,500,000 L 2500000 L × (1 m3 / 1000 L) = 2500 m3 답: 2500 m^3 2024. 3. 13.
25.00 cm 1.55 cm 0.50 cm Pb mass 220.9 g density 25.00 cm 1.55 cm 0.50 cm Pb mass 220.9 g density What is the density of lead (in g/cm3) if a rectangular bar measuring 0.50 cm in height, 1.55 cm in width, and 25.00 cm in length has a mass of 220.9 g? 납 시료의 부피 = 25.00 cm × 1.55 cm × 0.50 cm = 25.00 × 1.55 × 0.50 = 19.375 cm3 납의 밀도 = 질량 / 부피 = 220.9 g / 19.375 cm3 = 11.40129 g/cm3 답: 11 g/cm3 [키워드] 납의 밀도 기준 2024. 3. 11.
Ag 10.5 g/cm3 0.62 m mass kg Ag 10.5 g/cm3 0.62 m mass kg The density of silver is 10.5 g/cm3. What is the mass (in kilograms) of a cube of silver that measures 0.62 m on each side? 0.62 m = 62 cm cube의 부피를 계산하면, (62 cm)^3 = 62^3 cm3 질량으로 환산하면, (62^3 cm3) (10.5 g/cm3) (1 kg / 1000 g) = (62^3) (10.5) (1 / 1000) = 2502.444 kg 답: 2.5×10^3 kg [키워드] 은 입방체의 질량 기준 2024. 3. 11.
지구 둘레 25000마일을 킬로미터로 미터로 변환 지구 둘레 25000마일을 킬로미터로 미터로 변환 The circumference of the earth is 25,000 mi at the equator. What is the circumference in kilometers? in meter? > 1 mi = 1609.344 m (exactly, 정확한 값) ( 참고 https://ywpop.tistory.com/20863 ) 25000 mi × (1609.344 m / 1 mi) = 40233600 m = 4.0×10^7 m 4.0×10^7 m × (1 km / 1000 m) = 4.0×10^4 km [키워드] 길이 환산 기준, 거리 환산 기준 2024. 3. 11.
15 TW solar flux 680 W/m2 1.28×10^14 m2 15 TW solar flux 680 W/m2 1.28×10^14 m2 The total rate at which power is used by humans worldwide is approximately 15 TW (terawatts). The solar flux averaged over the sunlit half of Earth is 680 W/m2 (assuming no clouds). The area of Earth’s disc as seen from the sun is 1.28×10^14 m2. The surface area of Earth is approximately 197,000,000 square miles. How much of Earth’s surface would we need t.. 2024. 3. 10.
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