Chem

Could you please tell me if these are right?
How many moles are in the following.
A.) 80.0 g of NaOH I got 2.0 moles.

B.) 12.0 g of Ca(OH)2 I got 0.16 moles.

Write the simplest formula for each of the following compounds.

A.) 0.200 mole Al and 0.600 Cl. I got AlCl3

B.) 0.080 mole Ba, 0.080 mole S, 0.320 mole O. I got BaSO4

  1. 0
  2. 0
  3. 17
asked by Chris
  1. You threw away two perfectly good numbers for the first two.
    80.0/39.997 = 2.000 which rounds to 2.00 to three significant figures (you are allowed 3 from the 80.0).

    12.0/74.093 = 0.16196 which rounds to 0.162 to three s.f. (3 s.f. allowed by the 12.0)
    The other two are ok.

    1. 0
    2. 0
    posted by DrBob222
  2. hhj

    1. 0
    2. 0
    posted by jgjh

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    Initially, there are 33 moles of A and 0 moles of B. How many moles of A and B will be present after the system reaches equilibrium? a) 33 moles A; 0 moles B b) 0 moles A; 33 moles B c) 3 moles A; 30 moles B d) equal amounts of A
  2. CHEM MOLES !@@!

    Mole Calculation Worksheet 1) How many moles are in 15 grams of lithium? 2) How many grams are in 2.4 moles of sulfur? 3) How many moles are in 22 grams of argon? 4) How many grams are in 88.1 moles of magnesium? 5) How many moles
  3. Chemistry

    Consider the gas-phase equilibrium A ⇌ B. In a series of experiments, different initial amounts of A and B are mixed together, and the mixture in each case is allowed to come to equilibrium. Which one of these experiments would
  4. Chemistry

    Consider the gas-phase equilibrium A ⇌ B. In a series of experiments, different initial amounts of A and B are mixed together, and the mixture in each case is allowed to come to equilibrium. Which one of these experiments would
  5. Chemistry

    I can not determine the answer for this problem...can someone please help me? Determine the number if moles of MgO that form from the reaction of 4.4 moles of O2 in the following unbalanced reaction: Mg + O2 ----> MgO The balanced
  6. Chemistry

    The combustion reaction of propane is described by the reaction. C3H8 + 5O2 → 4H2O + 3CO2. How many moles of O2 are required to generate 3 moles of CO2? 2.5 moles 3 moles 4 moles 5 moles
  7. physics

    Find the number of moles in 2.00 L of gas at 35.0°C and under 7.41×107 N/m2 of pressure. Select one: a. 0.051 moles b. 51 ×105 moles c. 58 moles d. 5.8 moles
  8. Chemistry: stoich

    4. Suppose that an excess of propane, C3H8 , burns in 320 g of oxygen, How many moles of water will be formed? C3H8 + 5 O2 --> 3 CO2 + 4 H2O (1 point) 6.02 E 23 moles 1600 moles 4.0 moles 8.0 moles
  9. ELAC

    Consider equation 3A+B=C+D. You react 4 moles of A with 2 moles of B. Which of the following is true? 1) L.R. is one with higher molar mass 2) A is L.R. because you need 6 moles of A and have only 4 moles 3) B is L.R. because you
  10. Chemistry

    Given the balanced equation representing a reaction : 2Fe+ 3Cu^2+ --> 2Fe^3+ +3Cu When the iron atoms lose six moles of electrons, how many moles of electrons are gained by the copper ions? (1) 12 moles (2) 2 moles (3) 3 moles (4)
  11. Chemistry

    3Cu+8HNO3--> 3Cu(NO3)2+ 2NO+4H2O How many moles of HNO3 are required to react with 6 moles of Cu? How many moles of Cu(NO3)2 are produced when 3 moles of Cu react? How many moles of Cu must react to produce 4 moles of NO? If 4

More Similar Questions