阿霖 asked in 科學化學 · 1 decade ago

幫我解一下化學...可以給我答案 跟敘述過程嗎?

1) How many moles are there in 3.00 g of ethanol, CH3CH2OH?

A) 15.3 mol B) 138 mol C) 0.0652 mol D) 0.00725 mol

2) How many Fe(II) ions are there in 20.0 g of FeSO4?

A) 7.92 × 1022 iron(II) ions B) 4.57 × 1024 iron(II) ions

C) 1.82 × 1027 iron(II) ions D) 2.19 × 10-25 iron(II) ions

3) How many chloride ions are there in 4.50 mol of aluminum chloride?

A) 3.00 chloride ions B) 8.13 × 1024 chloride ions

C) 2.71 × 1024 chloride ions D) 13.5 chloride ions

4) What mass of phosphorus pentafluoride, PF5, has the same number of fluorine atoms as 25.0 g of

oxygen difluoride, OF2?

A) 23.3 g B) 0.933 g C) 10.0 g D) 146 g

5) Balance the chemical equation given below, and determine the number of grams of MgO are

needed to produce 10.0 g of Fe2O3 .

________ MgO(s) + ________ Fe(s) _ ________ Fe2O3(s) + ________ Mg(s)

A) 0.312 g B) 2.52 g C) 0.841 g D) 7.57 g

6) 5.0 g of iron is reacted with 5.0 g of water according to the chemical equation shown below. Which

one of the following statements is false?

3 Fe(s) + 4 H2O(l) _ Fe3O4(s) + 4 H2(g)

A) 6.91 g of Fe3O4 are produced. B) Mass is conserved in this reaction.

C) Water is the limiting reactant. D) 2.85 g of H2O are left over.

7) When silver nitrate reacts with barium chloride, silver chloride and barium nitrate are formed.

How many grams of silver chloride are formed when 10.0 g of silver nitrate reacts with 15.0 g of

barium chloride?

A) 9.40 g B) 8.44 g C) 18.8 g D) 11.9 g

8) What is the concentration of NO3- ions in a solution prepared by dissolving 25.0 g of Ca(NO3)2 in

enough water to produce 300. mL of solution?

A) 0.254 M B) 1.02 M C) 0.672 M D) 0.508 M

9) If the reaction of phosphate ion with water is ignored, what is the total concentration of ions in a

solution prepared by dissolving 3.00 g of K3PO4 in enough water to make 350. mL of solution?

A) 0.323 M B) 0.0404 M C) 0.162 M D) 0.0101 M

10) Which one of the following is not an empirical formula?

A) C2H4O2 B) CHO C) C2H4O D) CH2O

Update:

大毛毛

可以把過程傳給我嗎?

jimmy9403@yahoo.com.tw

Update 2:

另外,大毛毛,如果可以請順便幫忙解答我另一篇的化學問題好嗎?

感激不盡。

3 Answers

Rating
  • 1 decade ago
    Favorite Answer

    答案:1.ACDEB

    6.CDEBC

    解答晚點放上

  • 1 decade ago

    可以把解答傳到我信箱嗎?

    我不是主修化學

    我修電機的我對化學一竅不通=.=

  • Leonis
    Lv 5
    1 decade ago

    其他題目我沒有仔細去算,不過第10題的答案應該是A吧?

Still have questions? Get your answers by asking now.