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Josh G.

Questions and answers by Josh G.

Questions (22)

A Princeton prof. (mass = 70.0 kg), surprised by the large stopping force he calculates for jumping flat footed from a height of
1. 4 answers
2. 733 views
A small electric immersion heater is used to boil 191.0 g of water for a cup of instant coffee. The heater is labeled 355.0 W,
1. 2 answers
2. 621 views
use the double angle formula to rewrite.6cos^2-3 and (cosx +sinx)(cosx-sinx)
1. 3 answers
2. 490 views
Express your answer as a chemical formula.1.Cr^-3 and Br^- 2. Fe^3+ and O^2- 3.Hg2^2+ and CO3^2- 4.Ca^2+ and CIO^3- 5. NH^+4 and
1. 4 answers
2. 1,683 views
Consider the reactionCaSO4(s)rightleftharpoons Ca^2+(aq)+ SO_4^2-(aq) At 25 C the equilibrium constant is Kc = 2.4 \times 10^-5
1. 3 answers
2. 1,082 views
I got 4.9*10^-3 M. Thanks andIf the resulting solution has a volume of 1.9L , what is the minimum mass of CaSO4 (s) needed to
1. 2 answers
2. 528 views
simplify using imaginary number i.Division: square root of -5/square of -7.
1. 4 answers
2. 904 views
If pH = 6.6, calculate the molar concentration of H^ + (aq) in the solution.
1. 4 answers
2. 1,022 views
If ions O^2- are added to water, what reaction, if any, occurs?
1. 1 answer
2. 419 views
For acids of the same general structure but differing electronegativities of the central atoms, acid strength decreases with
1. 2 answers
2. 588 views
An unknown salt is either NaF, NaCl or NaOCl when 0.050 moles of the salt is dissolved in water to form 0.500 L of solution, the
1. 3 answers
2. 1,896 views
The value of Keq for the equilibriumH2 (g) + I2 (g) ↔ 2 HI (g) is 794 at 25 °C. What is the value of Keq for the equilibrium
1. 4 answers
2. 4,424 views
Calculate the pH of a solution at 25.0 °C that contains 1.94 × 10-10 M hydronium ions.
1. 2 answers
2. 707 views
Calculate the percent ionization of nitrous acid in a solution that is 0.311 M in nitrous acid (HNO2) and 0.189 M in potassium
1. 4 answers
2. 4,410 views
Given the following reaction at equilibrium, if Kc = 1.90 x 1019 at 25.0 °C, Kp = __________.H2 (g) + Br2 (g) ↔ 2 HBr (g)
1. 4 answers
2. 8,551 views
What is the pH at the equivalence point when 0.10 M HNO_3 is used to titrate a volume of solution containing 0.30 g of KOH?
1. 2 answers
2. 823 views
You are asked to prepare a pH=4.00 buffer starting from 1.50 L of 0.0200 \; M solution of benzoic acid C_6 H_5COOH and an excess
1. 4 answers
2. 1,400 views
starting with 1000 copies of a template, 35 cycles of PCR were performed. What is the theoretical yield of copies of double
1. 1 answer
2. 400 views
what is the trigonometric form of z=1+i?
1. 4 answers
2. 415 views
what is z= -2-2square root of 3i in trigonometric form.
1. 2 answers
2. 809 views
The normal boiling point of bromine (Br2) is 58.8°C, and its molar enthalpy of vaporization is ΔHvap = 29.6 kJ/mol.Calculate
1. 4 answers
2. 3,664 views
Consider the reaction 3CH_4(g)rightarrow C_3H_8(g)+ 2H_2(g).Calculate delta G at 298 K if the reaction mixture consists of 40atm
1. 3 answers
2. 634 views

Answers (6)

i got 6605kj but i think its too much.
what is z= -2-2square root of 3i in trigonometric form.
If ions O^2- are added to water, what reaction, if any, occurs?
both numbers negative
I got 4.9*10^-3 M. Thanks and If the resulting solution has a volume of 1.9L , what is the minimum mass of CaSO4 (s) needed to achieve equilibrium?
nvm got it

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