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Chemistry homework help?

My homework is 10 questions. I would perfer to have this done as soon as possible and I will pay extra if it can be done in a short amount of time. This is online homework so I can let you know immediately if it is incorrect. Thanks alot.

 

 

 

 

1.   If a sample of LiNO3 is found to contain 2.03 · 1018 N atoms how many moles of O atoms are present? Express your answer in scientific notation.

 

2.   If a sample of CO is found to contain 2.78 · 1018 O atoms how many CO molecules are present? Express your answer in scientific notation.

3.   How many C atoms are present in 0.902 g of C2H4 molecules? Express your answer in scientific notation.

4.   How many moles of Co atoms are present in 5.91 · 1019 Co[P(CH3)3]4 molecules? Express your answer in scientific notation.

 

5.   How many moles of O atoms are present in 6.55 · 1022 F2SO2 molecules?

6.   If a sample of (NH4)2HPO4 is found to contain 2.85 · 10-3 g of P atoms how many (NH4)2HPO4 formula units are present? Express your answer in scientific notation.

7.   If 860 mL of 0.0129 M aqueous Ba2+ and 430 mL of 0.0488 M aqueous HClO4 are reacted, how many mol of liquid H2O is produced?

Ba(OH)2(aq) + 2 HClO4(aq) → Ba(ClO4)2(aq) + 2 H2O(l)

8.   If 890. mL of 0.07384 M aqueous NaI and 810. mL of 0.07654 M aqueous NO3– are reacted stoichiometrically according to the equation, how many mol of NaI remained?

Pb(NO3)2(aq) + 2 NaI(aq) → PbI2(s) + 2 NaNO3(aq)

 

9.   If 590 mL of 0.0847 M aqueous H2SO4 and 390 mL of 0.295 M aqueous OH– are reacted, what mass (g) of liquid H2O is produced.

H2SO4(aq) + 2 NaOH(aq) → Na2SO4(aq) + 2 H2O(l)

 

10.   If 900. mL of 0.04444 M aqueous HClO4 and 740. mL of 0.02919 M aqueous Ba2+ are reacted stoichiometrically according to the equation, how many mol of HClO4 remained?

Ba(OH)2(aq) + 2 HClO4(aq) → Ba(ClO4)2(aq) + 2 H2O(l)

 

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