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Posts by Haile

Total # Posts: 14

chemistry
the concetration of HCl in a commercial concetrated HCl solution is given as 37%(W/W). calculate the molarity

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the concetration of HCl in a commercial concetrated HCl solution is given as 37%(W/W). calculate the molarity., normality of HCl in the solution . prepare 100.ml of 1N solution of HCl

maths
solve 2cos(2theta-pi)= -2 , -2 pi less or equal to theta less than 2 pi

math
solve for theta:2cos(2theta-pi)= -2 ,for -2pi less or equal to theta less than 2pi

social studiesw
how can objects we find today tell us about people who lived before written history

Physics
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Physics
Two men pushing a stalled car generate a net force of +655 N for 8.3 s. What is the final momentum of the car?

Chemistry
Write the correct symbol in standard form for the isotope of platinum that contains 118 neutrons.

Chemistry
Write the correct symbol in standard form for the isotope of platinum that contains 118 neutrons.

Math
Express the repeating decimal 0.513 (the 13 is repeating so the decimal is 0.5131313131313...) as a fraction in lowest terms using the infinite geometric series method.

Math
the 1 and the there are repeating so it's .513131313131313... and 489/900 isn't giving me that. could you explain it again?

Math
Express the repeating decimal 0.513 (the 13 is repeating) as a fraction in lowest terms using the infinite geometric series method.

chemistry
if there are 8.0 mg of Na+ contaminant per liter of water sample, calculate the number of moles of Na+ per liter. Calculate the weight of Na+ in a 1L sample of water that contains 1.00 x 10^2 umol Na+/L

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