Thank you!
I redid my questions and I got the following answers. Please let me know if they are correct!
I am really unsure about the significant digits!
1. 135.32g NH3
2. 1.85g H2
3. 9.93X10^19 molecules.
135.32 is right but I'll need to find the question again to check the others. Also, I doubt that the number of significant figures correct for this one.
I'll get back to you here.
I would round #1 to 3 places; i.e., 135 g.
#2 looks ok.
#3. I have 9.91 x 10^19 BUT I think we used slightly different molar mass for H2. Just check the numbers on your calculator to make sure.
Sure! I'll help you determine the correct number of significant digits in each answer you provided.
1. 135.32g NH3: To determine the number of significant digits, you need to consider the rules for significant figures. The rule is that all non-zero digits are considered significant. In this case, the number has five non-zero digits (1, 3, 5, 3, and 2), so the answer should have five significant digits. Therefore, your answer of 135.32g NH3 is correct.
2. 1.85g H2: Similar to the previous example, you need to count the number of non-zero digits. In this case, the answer has three non-zero digits (1, 8, and 5), which means the answer should have three significant digits. Therefore, your answer of 1.85g H2 is correct.
3. 9.93×10^19 molecules: The significant digits in scientific notation require a slightly different approach. In this case, the significant digits include all non-zero digits and any zeros between non-zero digits. Therefore, your answer should have four significant digits: 9, 9, 3, and 0. Your answer of 9.93×10^19 molecules does have four significant digits, so it is correct.
Great job on providing the correct answers! If you have any more questions or need further clarification, feel free to ask!