chem
What is the empirical formula of the compound with a mass percent composition of 70.0% Fe and 30.0% O? (Type your answer using the format CH4 for CH4
chemistry
Given the thermochemical equation below, calculate the amount of energy released when 250. g of NaOH (molar mass = 40.0 g/mol) reacts with an excess of HCl. Report answer to the correct number of significant figures in units of kilojoules, kJ. NaOH + HCl --> NaCl + H2O delt...
math
for for like a. it would be (2, 4) and (-1, 1)?
math
find the points of intersection of the following pairs of equations. a. y=x^2 and y=x +2 b. y=x^2 and y=8-x^2 c. y=x^2 and x=y^2
history
which president raises soft money in order to help democrat candidates in the 1996 election
Physics Eletric fields and coulomb's law)
Can someone solve this please
constitution/essay
Write your paper about a hypothetical proposal that is before the elected school board for the public schools in your city. The proposal stirs deep controversy in the community. Opponents claim that it would violate the Constitution’s prohibition against an “establis...
CHEMISTRY
Suppose a student adds 25.00 mL of 1.025 M HCl to a 1.50 g antacid tablet. The student boils and then titrates the resulting solution to the endpoint with 0.4969 M NaOH. The titration requires 21.3 mL NaOH to reach the endpoint. How many moles of HCl were neutralized by the NaOH?
Science Help! Ms. Sue Please!
8. Which of the following explains why the chemical products from a reaction have a different mass than the chemicals at the beginning? The products are heavier and sink. The products are lighter and rise. The products are a gas and escape into the air. The products are a soli...
math
1)find the sum of the odd integers from 25 to 75 2)find the sum of the first 20 terms in the series 10+5+2.5+1.25... . please show the steps to solve the problem^_^
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