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zurf:
Group Title
Use an enthalpy diagram to calculate the lattice energy of CaCl2 from the following information. Energy needed to vaporize one mole of Ca(s)…
 updated 10 months ago
 1 reply
 1 Medal
Mathematics

zurf:
Group Title
Can somebody help solve this? (ln differentiation)
 updated 10 months ago
 3 replies
 No Medals Yet
Mathematics

zurf:
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A lawn fertilizer is rated as 4.75% nitrogen, meaning 4.75 g of N in 100 g of fertilizer. The nitrogen is present in the form of urea, (NH2)…
 updated one year ago
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Mathematics

zurf:
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Radio waves travel at the speed of light, 3.00 × 108 m/s. If you were to broadcast a question to an astronaut on the moon, which is 239,000 …
 updated one year ago
 1 reply
 1 Medal
Mathematics

zurf:
Group Title
Density measurements can be used to analyze mixtures. For example, the density of solid sand (without air spaces) is about 2.84 g/mL. The de…
 updated one year ago
 1 reply
 1 Medal
Mathematics

zurf:
Group Title
Help me to balance the redox reactions occurring in acidic aqueous solution ! http://session.masteringchemistry.com/render?expr=%7B%5Crm+I%…
 updated one year ago
 1 reply
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Mathematics

zurf:
Group Title
Two capacitors, one 7.0 microfarad & the other 15 microfarad , are connected in series across a 15 V battery. Find the charge stored on ea…
 updated 2 years ago
 4 replies
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Mathematics

zurf:
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Two stationary positive point charges, charge 1 of magnitude 3.20 nanocoulomb and charge 2 of magnitude 1.80 nanocoulomb , are separated b…
 updated 2 years ago
 2 replies
 1 Medal
Mathematics

zurf:
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Prove 1/R = 1/R1 + 1/R2 + 1/R3 ?? (Resistant in parallel circuit)
 updated 2 years ago
 3 replies
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Mathematics

zurf:
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P(B)= 1/4, P(AUB)= 5/8, P(A'/B)= 2/3 . How to get P(A n B) and P(A) ?
 updated 2 years ago
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Mathematics

zurf:
Group Title
Find the derivative of f(x) = cos (2x^23)
 updated 2 years ago
 14 replies
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Mathematics