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Chemistry homework (recent questions)
Is calcium caltrate the same as calcium?
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The atomic number of an element determines which of the following:
1) mass, 2) building energy, 3) number of neutrons, or 4) chemical behavior.
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How many atoms of copper does a penny older than 1982 contain?
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What are molecular orbitals?
Not atomic orbitals.
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How much does one mole of ethanol weigh?
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In the reaction below (showing phosphorus reacting with oxygen to form diphosphorus pentoxide), if 0.97 moles of phosphorus get converted then how many moles of P2O5 are produced?
4 P(s) + 5 O2(g) ---> 2 P2O5(s)
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What is the molar mass of potassium phosphate?
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A 4 g mass of NaOH is dissolved in 5 mL of water. What is the approximate molar concentration of the NaOH?
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How many moles of iron atoms are there in 56 g of iron?
Assume that iron has an atomic mass of 56.
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How many hydrogen negative ions are in 5.06 g of SrH2?
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